Added new markup languages.
Moved the method to update the game-position-move relations to delayed_job.
Added indeces to models.
Implemented keyword search.
Remove timespamps from Appearance model
Implemented user ranking.
Improved css for the side menu.
Support "latest conclusion" template and average cp calculation.
Improved the table of game list.
Require login to see some information in the position.
Added book model, {{Book}} template, and Amazon API support.