Update InAppSettingsSpecifier.m for Xcode 5

Xcode 5: Conflict between length for NSString and NSLayoutConstraint, casting to NSString
Updating InAppSettingsPSTestFieldSpecifierCell.mil for iOS7

iOS7: Updating sizeWithFont (depreciated) to sizeWithAttributes
Update InAppSettingsTableCell.m for iOS7

iOS7: Updating sizeWithFont (depreciated) to sizeWithAttributes in TWO locations
Merge pull request #27 from LittleOrangeC/master

Updates for Xcode 5 and iOS7