reorganized files a bit

- SimpleAL -> Classes
- SimpleALTests -> Tests
- prefix header now in Other Sources
minor naming and property cleanup
more naming consistency
Merge pull request #2 from bashery/basher_reorg_files



    SimpleAL -> Classes
    SimpleALTests -> Tests
    prefix header now in Other Sources
Merge pull request #3 from bashery/basher_minor_cleanup


    Removed private method from public header and underscored it
    Underscored another private method
    Added missing nonatomic to property declarations
    Return instancetype instead of class name
    [[self class] alloc]... instead of [ alloc]
Removed NSArray al_constraintsByEnumeratingViewPairsWithRelationshipBlock:
Fixed the test target.  Added Tests.  Caught issues with greaterThanOrEqualToValue and lessThanOrEqualToValue methods.  Updated those methods to be correct.  Also changed offset: to constant: in all method names
Fixed an oops
Merge pull request #6 from tomabuct/RemoveEnumeratingViewPairs

Removed NSArray al_constraintsByEnumeratingViewPairsWithRelationshipBlock:
Made a private header for SimpleALViewProperty
Merge branch 'master' of github.com:Yelp/SimpleAL into testing_and_various_fixes
Change offset -> constant in variable names
Merge branch 'master' of github.com:Yelp/SimpleAL into documentation
Merge branch 'testing_and_various_fixes' of github.com:Yelp/SimpleAL into documentation
Fully documented the public methods
Updated comments to better document methods
Added default argument tests, and responded to feedback about some comments being incorrect
Merge pull request #7 from Yelp/testing_and_various_fixes

Added testing and various fixes caught by tests
Merge in of master
Added a proper .gitignore