added setChromeTitle for subclassing

setChromeTitle allows individual titles in a subclass
added setChromeTitle for subclassing

override setChromeTitle in a subclass for individual titles
Merge remote-tracking branch 'upstream/master'
Changed Object type --> causes compiler fault
Fixed activeRequest-queue - adding of the identifier key was missing
b2
Fixed issue when setting cache size of thumbnail and high quality image caches.
Using NI_WEAK

Use NI_WEAK macro to use either weak, assign, or __unsafe_unretained.
[photos] Fix strict compiler warnings for unsigned/signed comparisons.
[attributedlabel] Avoid crashes when calculating size of nil attributed string.
[pagingscrollview] Add pagingScrollViewWillChangePages:.
[core] Add NIIsRetina.
[attributedlabel] Always update the line height on the attributed string.

This avoids a bug where setting the line height to the same value doesn't cause the line height to be set on the attributed string if it's been changed.
[photos] When photos are loading, show an activity indicator view.
[photos] Add missing synthesis.
Fix up vertical alignment of images in attributed strings. Now supports top, bottom and middle alignment.
Merge pull request #303 from dmaclach/master

Fix up vertical alignment of images in attributed strings.
[pagingscrollview] Notify the delegate of page changes after an animation.
Add support for row re-ordering
Merge pull request #306 from francisli/submissions

Adds support for row re-ordering in NIMutableTableViewModel