Add RenderableDecorator.

Closes #524.
Fix repo list.
Fix use of API deprecated by Netty 4.1.
Inline the groovy Template interface.
Move all the Groovy templating stuff into `ratpack.groovy.template`.

Massive breaking change.
Use the correct replacement method for the deprecated `io.netty.handler.codec.http.HttpHeaders.isKeepAlive`
Fix code snippet
Fix code snippet
Fix code snippet
Close the HTTP client channel if the response has not been subscribed to (#414)
Add toggle imports in code examples in manual
Cache predicate instances needed for rendering.

Should make using the predicate cache more efficient.
Code style updates.
Move  'toggle imports' css and js to existing manual css/js files.
Add a layer of caching around path binding.
Revert "Add a layer of caching around path binding."

This reverts commit 135b08dab3eb8515c3c0fb0c501615a4cbf813c6.

This actually made things slower.
Don't wrap caching around single entry registries.
Add support for toggling import statements in Javadoc code samples.

Moved css classes for gutters to fonts.css. It is included in API as
well as in manual HTML pages.
Merge pull request #527 from zedar/master

Toggle import statements in source code in manual

Closes #520.
Add Robert Zakrzewski to contributor list.