Fix several folder picker bugs

* Fix a crash when the folder picker is loaded and the SDK becomes
  authorized outside of the folder picker due to view hierarchy
  inconsistencies. Fixes GH-44.
* Reset folder picker navigation title to nil when presenting the
  authorization webview.
* Ignore BoxSDKOAuth2ErrorAccessTokenExpired in error handler. This
  error code indicates the SDK is attempting an automatic refresh.
  It does not indicate a logged out state.
* Fix bug where navigation bar loses styling when the folder picker
  is dismissed and represented.
Add CocoaPods badges to READMEs
Update CocoaPods badges to point to HTTPS endpoints
Add CocoaPods upstream podspec and Rakefile to project
Implement rake spec to run unit tests on all platforms
Add macro to BoxLog.h to disable DEBUG build logging

Add documentation about DEBUG assertions and logging to BoxSDK.h
and BoxCocoaSDK.h.

Fixes GH-64.
Rakefile doesn't like single quotes in podspec
Update Rakefile to generate tags prefixed with 'v'.
Release v1.2.1
Fix XCode 5 and iOS 7 warnings

* Remove ARCH settings in xocdeproj for OS X builds
* Remove deprecated and unused trust result from BoxAuthorizationViewController

Fixes GH-63. Fixes GH-54.
Fix podspec definition to include all headers and create public headers

The previous podspecs did not include BoxSDK.{h,m}.
Release v1.2.2
Merge pull request #68 from box/xcode-5-ios7-warnings

Fix XCode 5 and iOS 7 warnings
Fix warnings from XCode analyzer

Fixes GH-71.
Merge pull request #72 from box/xcode-analyzer-warnings

Fix warnings from XCode analyzer
Kill ODRefreshControl and listen to notifications from the SDK only when appropriate in folder picker
Merge branch 'folder-picker-bugs'

Conflicts:
	BoxSDK.xcodeproj/project.pbxproj
Can no longer build with iOS 5.x SDK

{buildfix}
Update deployment target to 6.0