Added 64bit / arm64 support for ObjectiveFlickr

Removed  < ios 6 Support.
Merge pull request #54 from rheza/master

Added 64bit / arm64 support for ObjectiveFlickr
Merge pull request #51 from fotonauts/cancel-request-on-dealloc

should cancel the request when we don't need it anymore
Merge pull request #50 from fotonauts/better-fix

real way to solve the retain release problem
Merge branch 'lukhnos-objectiveflickr-master'