Refactor statistics

I made a new controller to handle statistics. The old statistics have been moved in that controller and a new action has been added to display idle feeds. I also added a menu in the left panel to navigate between the statistics pages.
See #90
Refactor idle feed stats
Fix syntax
Refactor statistics

I made a new controller to handle statistics. The old statistics have been moved in that controller and a new action has been added to display idle feeds. I also added a menu in the left panel to navigate between the statistics pages.
See #90
Refactor idle feed stats
Fix syntax
Refactor and formatting
Merge branch 'stats' of https://github.com/aledeg/FreshRSS into stats

Conflicts:
	app/Controllers/statsController.php
	app/Models/StatsDAO.php
	app/i18n/en.php
	app/i18n/fr.php
	app/layout/aside_stats.phtml
	app/layout/header.phtml
	app/views/index/stats.phtml
	app/views/stats/idle.phtml
	app/views/stats/index.phtml
	app/views/stats/main.phtml
Merge pull request #516 from aledeg/stats

Refactor statistics