persistent connections by default

Cleaning up my mess

This fixes issue jamescauwelier#13 by updating minimal requirements f…

…or PHP

Updating dependencies to reflect the minimum required PHP version

This closes jamescauwelier#12 by commiting the Vagrantfile

Merge branch 'hotfix-0.2.3-alpha' into develop

Fix some dependencies

Fix an integration test that was not executed as designed. The crash …

…should happen in between redis commands, not before all commands.

Cleanup and auto-failover class

First working version of the sentinel master discovery