Merge pull request #18 from setdirection/master

merge SetDirection ios-shared.
Added option to enable accessbility for the nav bar tab
Added proper comment and added UIAccessibilityTraitButton to nav bar tab
Fix for detecting retina screens
Merge branch 'master' of github.com:walmartlabs-samsclub/ios-shared
Merge pull request #131 from walmartlabs-samsclub/adding-accessibility-to-nav-bar

Adding accessibility to nav bar
Merge pull request #132 from walmartlabs-samsclub/master

Fix Retina Detection
Update PickerModalViewController to handle iPhone 6/6+ screen sizes (but still work the same on older devices)
Merge pull request #135 from walmartlabs-samsclub/feature/iphone6_PickerModalViewController

Update PickerModalViewController to handle iPhone 6/6+ screen sizes (but...
Fix test to work outside of Portland.
Merge pull request #136 from walmartlabs-samsclub/issue/fix-date-math-and-test

Fix test to work outside of Portland.
use UIColor property set in superclass to indicate background color for simple tables
Merge pull request #138 from walmartlabs-wmusiphone/issue/dont-hardcode-colors-in-ios-shared

Issue/dont hardcode colors in ios shared
Merge branch 'master' of https://github.com/setdirection/ios-shared into kazoo_dev
Merge pull request #37 from walmartlabs-wmusiphone/merge/from_set_direction

Merge/from set direction
Merge branch 'kazoo_dev' into feature/CB-2565-efficient-table-updating