Revert "Revert "Deps update. Symfony 2.6 & Fastest (Tests Parallelisation)""

This reverts commit d99bc0ec66911267a80534b4a0b7744cb087e261.
Update deps
Merge branch 'master' into task/deps-update

Conflicts:
	composer.phar
Update deps to symfony 2.6.1 and doctrine 2.5.0
Update deps
Merge branch 'master' into task/deps-update

Conflicts:
	composer.lock
	composer.phar
Merge pull request #54 from michaelcullum/task/deps-update

Update deps