Minor cleanup to tables
Should fix travis errors

Cannot write into the `/Users/travis/Library/RubyMotion/build' directory, please remove or check permissions and try again.
Merge pull request #452 from clearsightstudio/fix-travis

Fix travis
Merge branch 'pm2' of github.com:clearsightstudio/ProMotion into pm2
TableViewCellModule cleanup

* Slimmed down TableViewCellModule by 30%
* Re-enabled some long-disabled tests (they passed)
* Added the `style:` attribute for cells — they no longer take
arbitrary attributes in the main hash, but will `set_attributes` with
whatever is in `style:`
* Removed a failing and head-scratching web bridge RPC spec (no idea
what it was for)
Merge pull request #453 from clearsightstudio/refactor/table_view_cell_cleanup

Refactor/table view cell cleanup
Copy/paste typo
Merge branch 'refs/heads/pm2' into tablescreen-longpress

* refs/heads/pm2:
  TableViewCellModule cleanup
  Should fix travis errors
  Minor cleanup to tables