Update the documentation to include the changes made in 0.5.

The documentation has been updating to include details about the changes
made in 0.5. There is also a new section in the iOS example project to
demonstrate mas_remakeConstraints.
Merge pull request #77 from samsymons/documentation-updates

Update the documentation to include the changes made in 0.5.
Merge pull request #78 from Lightricks/feature/fix-unused-variables

Add __unused for unused method parameters.
Update README.md
Update README.md
Fix priority constants preventing compilation under Xcode 6/LLVM 3.5
Merge pull request #84 from zwaldowski/master

Fix priority constants preventing compilation under Xcode 6/LLVM 3.5
Use strongDelegate to fix error: weak property may be unpredictably set to nil
Fix warning: implicit conversion changes signedness: 'int' to 'unsigned int'
Merge pull request #86 from realestate-com-au/master

Minor fixes for stricter compiler warnings
make UIScrollView demo more self-explanation
Merge pull request #90 from 0oneo/uiscrollview_demo

simplify UIScrollView demo
Update MASExampleScrollView.m
v0.5.3
fix typo
Merge pull request #91 from 0oneo/fixTypo

fix typo
Update example to show more features

I had been using masonry for a couple of months before I realised that I could just do top.left etc. An example in the readme would have exposed me to this awesomeness earlier!
Merge pull request #93 from ryanmaxwell/master

Update example to show more features
fix travis build
Update README.md