Included support for custom annotation processing.
Aid end users more in the context of the code snippets

Copy-paste ready code should provide some context as to where the snippet
belongs, this hinting should prevent some problems.
Apply the hinting also in the Korean docs
Add the context of the plugin in the example snippet in the README
Querydsl team code review adjusts.
Copyright adjust.
More code review adjusts.
Merge pull request #999 from querydsl/doc_hints

Aid end users more in the context of the code snippets
Externalized @Temporal JPA annotation helper.
Changed cache key to a List<?> produced by a ImmutableList.Builder.
Merge pull request #996 from dyorgio/master

Included support for custom annotation processing.