add cover image to each board
Merge branch 'master' of https://github.com/farcryzry/CMPE203-Group1

Conflicts:
	tackaholic/development.db
	tackaholic/pinry/core/api.py
	tackaholic/pinry/core/api.pyc

tackaholic/pinry/core/migrations/0003_auto__add_category__add_field_tack
_board.pyc
	tackaholic/pinry/core/models.pyc
	tackaholic/pinry/core/urls.pyc