- Add Nudge model.
- Add Route for SetNudges.
- Add setNudges, deleteNudges, and isNudgeSet in User Controller.
- Modify SQL file, change to nudges table, from "messages" to "message"
Merge branch 'master' of https://github.com/leovander/CorrelaterBackEnd

# By leovander
# Via leovander
* 'master' of https://github.com/leovander/CorrelaterBackEnd:
  Working on Facebook Event Pulling