Made S2Geometry static, added coordinateForCellId, CoreData optimizations
Added XM to Scanner
Update README.md
Turned ONLY_ACTIVE_ARCH off, so it will work on armv7 and armv7s
Update README.md
Added gameplay video to README
Added SDWebImage, great framework!
Minor UI improvement
Merge pull request #3 from alex-alex/master

Sync with Master