Moving Doctrine Fixtures to Dev-only

This matches composer config.
Merge pull request #154 from rdohms/patch-4

Moving Doctrine Fixtures to Dev-only
Weird space changes in composer/ symfony requirements files
Made abstract Base class a "parent" service to the Bliptv and YouTube services, setter-injecting EntityManager as all three use it
Refactored existing import services to take account of the DI changes made to services.xml
Refactored to improve readability (I hope) and added import confirmation email method
Merge branch 'master' of https://github.com/protalk/protalk into issue-20