Enabled SpringLoaded caching to make development time app startup faster.

Closes #281.
Include a call to `ulimit -a` when building in Travis CI

I don't think ulimits are the cause of our OutOfMemoryErrors, but this info helps to exclude a possibility.
Changing travis CI configs works better if you get the stanza name correct

Should have been `before_install`, not `before_script`.
Travis: no need for `./gradlew assemble in `before_install`

By default it's included in `install`.  My mistake thinking it was actually in `before_install`.
Make link crawling more resilient

* Fixed a bug where errors that had no document would be overlooked
* Added ability to register URLs to only warn, not fail the build
Travis: disable default `./gradlew assemble` step
Add GroovyChainAction, making it more convenient to bust up the ratpack.groovy handlers.
Fix extremely confusing error message.
Make pretty printing the default output when rendering with Jackson.

Closes #283.
Remove this test.

It's problematic and very old.
Make working with the registry a little easier in unit tests.
Fix some incorrect docs on PathBinding.
Make it easy to add path tokens for handler unit tests.
Manual updates for Coda Hale Metrics (#206), addresses review comments
Make it possible to examine the registries after a unit test invocation.
Implementing fromJson and adding generic object parser
Removing unused imports
Moving ObjectParse to internal package
Fixing checkStyle violation
Merge pull request #288 from craigburke/fromjson

Initial attempt at fromJson method in jackson module