Fix Issue #31

The BoxAuthorizationViewController is upside-down on iOS 5.1.1
Add comments for the fix of #31
Convert custom folder picker cell to use standard UITableViewCell views instead of drawRect

These cells are just cells with the style UITableViewCellStyleSubtitle. The subview positioning
is retained.

This patch introduces a UI change: thumbs are displayed at a logical 32x32 instead of a logical
40x40. The thumbs returned by the API are either 32x32 or 64x64. On retina displays we use the
64x64 thumbs and they are displayed at native resolution.
Enable SDK users to localize the folder picker strings
Update cell alphas on setEnabled
Merge pull request #29 from box/ios7/folder-picker

Convert custom folder picker cell to use standard UITableViewCell views instead of drawRect
Merge pull request #32 from porter-liu/master

Fix Issue #31
Enable localization on empty filesize string
Add xccheckout to .gitignore
Fix tests to work with Xcode 5

This is a breaking change. The test script will no longer run with Xcode 4.5.
Merge pull request #35 from gcurtis/fix-tests-squashed

Fix tests to work with Xcode 5
Ensure there is an autoreleasepool properly set up for the API Operation thread

The API Operation thread is long lived and may accumulate memory without this pool.