Allow subclasses to override cache key and background tag for cell background images, since we allow them to override imageForFirst:last:highlighted:drawDivider:. This way the caching facility of imageForFirst:last:highlighted:drawDivider: can be used by subclasses that override that method but call super.
Merge pull request #528 from darrenw/CellBackground

Allow NICellbackground subclasses to override cache key and background tag for cell backgrounds.
[networkimage] Suppress warning about formatting values to strings.
[networkimage] Implement basic maxAge support again.

Closes #286.
Update AFNetworking to 2.2.1.
[core] Deprecate NIInvocationWithClassTarget in favor of NIInvocationWithInstanceTarget.

Closes #531.
Fix for incorrect Switch target/selector  handling on the devices with armv64 architecture
Merge pull request #534 from PaulTaykalo/master

Fix for incorrect Switch target/selector  handling on the devices with armv64 architecture
Fixes an issue where the NIPhotoScrollView might set its min/max zoom scales too low, because it didn't take into account the image's scale.
Merge pull request #536 from compositeprimes/photos

Fixes scaling in NIPhotoScrollView
If the client has iOS7, uses the new |drawViewHierarchyInRect:afterScreenUpdates:| method in NISnapshotRotation, which renders UIDatePickers in iOS7 correctly.
Merge pull request #537 from compositeprimes/snapshot

Use modern methods for view snapshots if available.
Changing how Nimbus does table snapshots so that if a tableview have a clear background, on a rotation, it does not exist assume that the proper background is black.
Merge pull request #538 from LiyeZhang/master

Fixing bug where tableviews with clear backgrounds turn black on rotation
Use relpath for AFNetworking.

Closes #541.
[core] Add deprecation warning guards around -[NSString sizeWithFont:constrainedToSize:lineBreakMode:] calls.
Merge pull request #544 from jverkoey/deprecation_suppression

[core] Add deprecation warning guards around -[NSString sizeWithFont:constrainedToSize:lineBreakMode:] calls.
 * bug fix infinite loop on applyViewStyleWithRuleSet:inDOM
Merge pull request #545 from rbang1/master

 * bug fix infinite loop UIScrollView+NIStyleable
Fixed 64-bit compile time warnings