Deprecated Silex service provider

Added a way to use contains method on event without end

Removed hhvm from travis build file (seems to be incompatible with ph…

…punit

Merge pull request #43 from garak/patch-1

Allow Symfony3

Fixed an edge case with basic provider

Simplified basic event provider

 * Used < & > operators instead of DateInterval->invert
 * Fix HHVM test

Added namespace handling to Cache provider

Updated dependencies

Added initialization of event array in Basic provider

Fix #22

Merge pull request #20 from yohang/fix-extra-week

Fixed unwanted extra week for months starting by their first weekday