backup on items
Merge branch 'server-dan' of https://github.com/fixmycode/ReinoAritmetico into server-dan
finished item CRUD
 Equip Item to Player API Method added.

Considerations: Left the item_kind_id parameter in the function but never use it since the item knows what its item type is.
Removed item_type api request parameter
double equip = unequip feature finished
Fixed typo and wrong image proportions on items table
Tags Implemented
item api stuff
merge server dan into tags
image editing and creating added to items tables
The node sends answers to the server. TODO: the server saves that data to the DB
Tag CRUD Finished
Merge branch 'tags' of https://github.com/fixmycode/ReinoAritmetico into tags
Fixed migrations; Fixed items API; Now errors are shown in json format, much simpler to read; Fixed player virtual attributes
Removed the inventory Endpoint, now use with list?player=android_id
Added two tables to save the answers on each games
Finished first version of the game saving functions
Changed the scopeQuery to return the problem answers given by the (gameid, playerid)
first graph