In category listing: load 50 items at a time
admin edit pins: paginate 50 items in category search
edit pins: change to edit with button and image

In order to allow multiple selection of items, the edition of the pin is done now through a button or the pin image.
edit pins: edit only through the button, not image.
edit pins: Select and Unselect all pins
edit pins: Button to delete selected pins
Add an option in admin to remove items from categories
Fix pagination in category selection
Add an option in admin to remove items from categories
Update settings.py

Set SEARCH_PINS to false to prevent site pins from appearing in the search results.
Update settings.py

Added console handler for logging, set log level to debug and enabled it for modules
Revert logging code
Fixed add to weblist from site on profile page
Models for user, album, picture, picture likes, picture comments on SQLAlchemy. Rewrited part of User API methods using this models.
Added method which renders board (list) individual page, by username and board name, refs #402
Refs #403 Allowed to follow boards

 - Added schema for boards_followers with constraints to enforse data integrity
 - Added API method which allows to follow/unfollow a given board
 - Added view which passes request to an API method
 - Added JS handler for follow/unfollow board clicks
 - Cleaned up "Add board" buttons from several templates
After merge fixes
loading bar fix
Fixed after merge bugs
Fixed bugs on profile page