Update README.mdown

Properly hides the HUD at completion.
MBLabelAlignmentCenter doesn't need to be in header, could end up with multi-declaration of value
Replaced fix class type through instancetype and used self in static methods instead of fixed class reference to enable improved subclassing
Additional note regarding the Static library integration.
Performed recommended Xcode 4.6 project updates.
Updated license and added a LICENSE file.
Merge pull request #112 from coryallegory/master

MBLabelAlignmentCenter risk of being defined multiple times
Merge pull request #109 from dnstevenson/master

Fixed example in Readme
README cleanup and cocoapods instructions.
Added podspec for version 0.6.
Merge branch 'cocoapods'
Version bump and change log update.
Removed screenshot entries from the podspec.
A few documentation fixes.
Added macro for compilers which doesn't support instancetype
Merge pull request #125 from mrackwitz/master

Improved subclassing
Slight macro formatting cleanup.
Added .travis.yml.
Published schemes.
Added build status to the readme.