Cleaning up some of the simpler warnings cluttering the Issue Navigator.

Now that we're building for 64-bit, we have to cast all of our NSIntegers and NSUIntegers before using them in format strings.
Clean up the last of the format string cast warnings.
Clean up implicit conversion warnings.
Remove unused launch image to quiet warning.
Merge pull request #543 from MIT-Mobile/3.6/easy-warnings

Clean up most of the trivial warnings
Add new bar button artwork.

- Hamburger, grid, list, and selected list.
- Collapse redundant image name constants.
Make list button in Campus Map toggle.

Partial progress on #491.
Add place category icons to Campus Map.

Partial progress on #491.
Remove accidentally included files.
Merge pull request #542 from MIT-Mobile/bar-button-assets

Bar button assets
Use SMCalloutView's rightAccessoryView in Tours.

SMCalloutView has a pretty good approximation of MapKit's callout layout. Might as well take advantage of it.

Reduces the amount of whitespace on right side of Tours callouts.
Make map links from People open in Maps. #540
Merge pull request #544 from MIT-Mobile/3.6/tours-callout-layout

3.6/tours callout layout
Fixed prompt for login on iPad libraries #511
Removed "Put Hours Here" label from library info #512