Add `Halibut.load_json` convenience method
Merge pull request #6 from pezra/convenience-methods

Add `Halibut.load_json` convenience method
removes coderwall badge and adds gitter.im one
Fixes rubinius dependency for travis
link href
Ignores IntelliJ's folder
removes whitespace
adds MIT licence to gemspec
Adds missing `addressable` dependency
Tweaks Link#== to account for `addressable/uri` objects
Improves namespace tests