enabled ios tab
Added docs and samples for ios
Added samples for iOS
merged
Fixed a tpyographical error, corrected misspelled 'Raduis' to 'Radius'
keywords added for iOS
Merge branch 'ios' of https://github.com/appacitive/appacitive-docs into ios
Merge pull request #15 from appacitive/ios

Changes verified.
Merged ios branch with develop.