Merge pull request #25 from Logicopolis/patch-1

Update Connection.groovy
fix for missing property in Raven Client
groovy.lang.MissingPropertyException: No such property: exception for class: grails.plugins.raven.RavenClient
support for additional attributes in User object
Merge pull request #26 from jglapa/missing-property-fix

fix for missing property in RavenClient
README update for additional user attributes
Merge pull request #27 from jglapa/additional-attributes-for-user

support for additional attributes in User object
Merge remote-tracking branch 'upstream/master'
Grails upgraded to 2.3.7
Travis config updated + Grails wrapper
Version bumped to 0.5.8
README update