Added SQLAlchemy support, refs #398
Models for user, album, picture, picture likes, picture comments on SQLAlchemy. Rewrited part of User API methods using this models.
Updated add comment API method for picture and like/dislike API method
Merge branch 'live' into alchemy
Merge branch 'live' into alchemy
Fixes for new alchemy code
Merge branch 'alchemy' of github.com:OlegYarosh/pin into alchemy
Changed pic in image/query API method. Changed pic in user_query in entities
Fixed profile page errors
Updated frontend part and API methods according to last changes (sqlalchemy)
Fixed merge conflict from branck live to alchemy