Provide an alias to 'eq' in the Query DSL

The alias would provide a better experience for Scala users that make use of the QueryDSL.
Currently FilterConditionEndContext.eq conflicts with scala's AnyRef.eq() method since the scalac compiler cannot infer based on the context. Similar problem with other libraries:

https://github.com/etorreborre/specs2/issues/361
https://datastax-oss.atlassian.net/browse/JAVA-290