resolves #778, rewrite converter API; resolves #638, integrate thread_safe gem

- rewrite converter API
- separate built-in converters from template converter
- rename renderer/render to converter/convert
- make converter an extension point (resolves #778)
- base built-in converters on the converter API
- rename template_name property to node_name on AbstractNode
- make block_ prefix on file name of block-level templates optional
- use thread_safe gem for template and converter caches (resolves #638)
- introduce Stylesheets API to manage stylesheets
- move file write logic to Document
- delegate file write logic to converter that implements Writer
- remove compact logic, deprecate related options
- duplicate options and attributes passed to APIs, add tests
- assign doctype / backend attributes correctly when document is loaded, add tests
- report proper error if nil is passed to load_file and convert_file
- use span tag to group kbd combination in html5 backend
- setup toc in preamble if toc attribute is preamble
- Opal compatibility fixes, use built-in HTML5 converter
- make the outline method accessible to all html converters
- document the converter APIs along with some minor cleanups in terminology
- load stylesheets from data directory
- rename ruler block to thematic_break
- add inline? and block? query methods to AbstractNode
- use Timings class to measure and report timings from processor steps
- fix cucumber tests
- upgrade tilt dependency to 2.0.0
- minor optimizations

4 files changed, 24 insertions, 24 deletions

diff --git a/features/open_block.feature b/features/open_block.feature
index 000b29a7..f50070eb 100644
--- a/features/open_block.feature
+++ b/features/open_block.feature
@@ -12,8 +12,8 @@ Feature: Open Blocks
     A paragraph in an open block.
     --
     """
-  When it is rendered using the html backend
-  Then the output should match the HTML source
+  When it is converted to html
+  Then the result should match the HTML source
     """
     <div class="openblock">
     <div class="content">
@@ -32,8 +32,8 @@ Feature: Open Blocks
     A paragraph in an open block.
     --
     """
-  When it is rendered using the docbook backend
-  Then the output should match the XML source
+  When it is converted to docbook
+  Then the result should match the XML source
     """
     <simpara>A paragraph in an open block.</simpara>
     """
@@ -46,8 +46,8 @@ Feature: Open Blocks
     A paragraph in an open block.
     --
     """
-  When it is rendered using the html backend
-  Then the output should match the HTML structure
+  When it is converted to html
+  Then the result should match the HTML structure
     """
     .openblock
       .content
@@ -63,8 +63,8 @@ Feature: Open Blocks
     A paragraph in an open block.
     --
     """
-  When it is rendered using the docbook backend
-  Then the output should match the XML structure
+  When it is converted to docbook
+  Then the result should match the XML structure
     """
     simpara A paragraph in an open block.
     """
@@ -79,8 +79,8 @@ Feature: Open Blocks
     * three
     --
     """
-  When it is rendered using the html backend
-  Then the output should match the HTML structure
+  When it is converted to html
+  Then the result should match the HTML structure
     """
     .openblock
       .content
diff --git a/features/pass_block.feature b/features/pass_block.feature
index 24b7212d..77d4f8a8 100644
--- a/features/pass_block.feature
+++ b/features/pass_block.feature
@@ -16,8 +16,8 @@ Feature: Open Blocks
     image:tiger.png[]
     ++++
     """
-  When it is rendered using the html backend
-  Then the output should match the HTML source
+  When it is converted to html
+  Then the result should match the HTML source
     """
     <p>{name}</p>
 
@@ -36,8 +36,8 @@ Feature: Open Blocks
     image:tiger.png[]
     ++++
     """
-  When it is rendered using the docbook backend
-  Then the output should match the XML source
+  When it is converted to docbook
+  Then the result should match the XML source
     """
     <simpara>{name}</simpara>
 
@@ -57,8 +57,8 @@ Feature: Open Blocks
     image:tiger.png[]
     ++++
     """
-  When it is rendered using the html backend
-  Then the output should match the HTML source
+  When it is converted to html
+  Then the result should match the HTML source
     """
     <p>value</p>
 
diff --git a/features/step_definitions.rb b/features/step_definitions.rb
index 382d9923..0f84b42f 100644
--- a/features/step_definitions.rb
+++ b/features/step_definitions.rb
@@ -7,22 +7,22 @@ Given /the AsciiDoc source/ do |source|
   @source = source
 end
 
-When /it is rendered using the html backend/ do
-  @output = Asciidoctor.render @source
+When /it is converted to html/ do
+  @output = Asciidoctor.convert @source
   #File.open('/tmp/test.adoc', 'w') {|f| f.write @source }
   #@output = %x{asciidoc -f compat/asciidoc.conf -o - -s /tmp/test.adoc | XMLLINT_INDENT='' xmllint --format - | tail -n +2}.rstrip
   ##@output = %x{asciidoc -f compat/asciidoc.conf -o - -s /tmp/test.adoc}
 end
 
-When /it is rendered using the docbook backend/ do
-  @output = Asciidoctor.render @source, :backend => :docbook
+When /it is converted to docbook/ do
+  @output = Asciidoctor.convert @source, :backend => :docbook
 end
 
-Then /the output should match the (HTML|XML) source/ do |format, expect|
+Then /the result should match the (HTML|XML) source/ do |format, expect|
   @output.should == expect
 end
 
-Then /the output should match the (HTML|XML) structure/ do |format, expect|
+Then /the result should match the (HTML|XML) structure/ do |format, expect|
   case format
   when 'HTML'
     options = {:format => :html5}
diff --git a/features/xref.feature b/features/xref.feature
index 720136ed..d9c29025 100644
--- a/features/xref.feature
+++ b/features/xref.feature
@@ -16,8 +16,8 @@ Feature: Cross References
     
     Instructions go here.
     """
-  When it is rendered using the html backend
-  Then the output should match the HTML structure
+  When it is converted to html
+  Then the result should match the HTML structure
     """
     table.tableblock.frame-all.grid-all style='width: 100%;'
       colgroup