Revert "Merge pull request #1 from doubleencore/annotation_gson"

This reverts commit 9b46de6c191ac9f3af65f4d9483016688fcb2e46, reversing
changes made to d49f1800a64504e693962c47d0f49cda46301685.
Update gradle
Add support for custom DAO superclass
Add custom annotation support from https://github.com/greenrobot/greenDAO/pull/67
Merge pull request #2 from doubleencore/annotation_support

Annotation support