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]