Allow Symfony versions > 2.4#6

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ChristopherMoll wants to merge 2 commits intocodeconsortium:masterfrom

ChristopherMoll:patch-1

Commits on Jan 28, 2016

Allow Symfony versions > 2.4
ChristopherMoll
committed

Commits on Jan 29, 2016

Symfony version should match readme
ChristopherMoll
committed