Feature 1.3, 1.x Update

**Version 1.3**
New delegate methods to specify line color and alpha. Deprecated some delegate methods and replaced with newer delegate methods with more parameters. New calculation methods. New graph snapshot method. Made some properties private. Updated Sample App.

**Version 1.3.1**
Added pre-compiler check for the Objective-C Module Build Setting. Modules are used if enabled, otherwise traditional imports are used. Added a warning for projects without ARC. Updated the README.md with documentation for new methods and delegates. Tidied up other files.

**Version 1.3.2**
Added call to super in layoutSubviews. The reloadGraph method now calls setNeedsLayout instead of directly calling layoutSubviews. Added new method parameters to alpha-methods. Fixed typos.

**Version 1.4**
Added new calculation (sum). Added two new delegate methods (`lineGraphDidBeginLoading:` and `lineGraphDidFinishLoading:`). Fixed bug with total number in sample app.

**Version 1.5 Beta**
New methods and features. Available on the feature branch.