Capture renders from any handler when unit testing (fixes #244)
Standard noop action impl.
Docs and tidy up in the registry package.
Remove isEmpty() from Registry.

Better to have builders indicate their size as isEmpty() is a hard question to answer for some registries.
Javadoc.
Update to latest handlebars.
Workaround the change (bug?) where Handlebars.with(TempateCache) return type is HelperRegistry instead of Handlebars.
Closes #225.
Merge remote-tracking branch 'origin/master'
Checkstyle fix.
Use direct buffers for the response.
Use the right buffer allocator.
Remove registry caching.
Optimize response buffer handling.

We weren't using pooled buffers, and we were eagerly allocating buffers which might not have ever been used.
Don't validate request headers.
Allow headers to be set as CharSequence so Netty's HttpHeaderEntity can be used.
Use HttpHeaderEntity for common headers.
Fix excludes on Rest Assured.
Use 'groovy-all' instead of 'groovy' as its asm and Guice's conflict (#243).
Fix Groovy dependency.
Remove uneeded dependency.
Add back missing Ant dependency.