Enabling page caching.

Signed off by: Rafael Reggiani Manzo <rr.manzo@gmail.com>
Cache to homepage projects listing

Signed off by: Rafael Reggiani Manzo <rr.manzo@gmail.com>
Caching to metric and module results.

Missing cache to graphics.

Signed off by: Rafael Reggiani Manzo <rr.manzo@gmail.com>
Actionpack-action_caching gem

Signed off by: Rafael Reggiani Manzo <rr.manzo@gmail.com>
Graphic of metric history with caching

Pending unit tests

Signed off by: Rafael Reggiani Manzo <rr.manzo@gmail.com>
New metric history chart tool: Chart.JS

This change was necessary to be able cache the action

Pending:
 * Do not render a graphic for a single point
 * Loading animation is not working
 * Unit and acceptance tests for the graphic failling
 * Renable the action cache

Signed off by: Diego Araújo <diegoamc90@gmail.com>