Merge pull request #22 from benorama/master

Bug fix when raven config is not defined.
Update .travis.yml
Merge pull request #24 from benorama/master

Remove commons codec Base64 dependency when building message body (for G...
Update grails version to 2.3.4 on travis-ci.
Trying with gvmtool.
Add developer.
Add default container plugin.
Bump version to 0.5.4.
Update README.md
Update README.md
Update documentation.
Revert "Update README.md"

This reverts commit 21eb9fb578d99a6a9c756573dac8d84f462f1c0e.
Version bumped to 0.5.6-SNAPSHOT