Set Deployment Target to 10.9
Set SDK Root to "macosx"
fix crash bug on Yosemite Developer Preview 5
supress warning
Use recommended build settings
Cast, cast, cast!
Merge branch 'yosemite'
Convert to Modern Objective-C Syntax

Modernization options:

- Add attribute annotations                 : yes
- Atomicity of inferred properties          : nonatomic
- Infer designated initializer methods      : yes
- Infer instancetype for method result type : yes
- Infer protocol conformance                : yes
- Infer readonly properties                 : no
- Infer readwrite properties                : no
- ObjC literals                             : yes
- ObjC subscripting                         : yes
- Only modify public headers                : no
- Use NS_ENUM/NS_OPTIONS macros             : yes
Merge branch 'modernize'