Updated the composer.json
Updated the composer.json

- Added the branch alias for the master branch
- Fixed the minimum requirement for FrameworkBundle as 2.0 should use the older branch
- Changed the Pagerfanta constraint to a range to allow stable versions for future releases
pepeh/WhiteOctoberPagerfantaBundle,jrobeson/WhiteOctoberPagerfantaBundle,pepeh/WhiteOctoberPagerfantaBundle,jrobeson/WhiteOctoberPagerfantaBundle