Support of graphView in UIScrollView

Thank you to @nmattisson for this addition to the graph. See issue Boris-Em#12.

Minor fixes

- Changed the padding on the graph to make sure the line doesn't gets
drawn outside the view.
- Updated README.md.
- Fixed Warning in the Sample Project by deleting duplicate files in
Build Phases (README and License).

Merge branch 'release'

V2.0

    Deprecated some delegate methods and replaced with newer delegate methods with more parameters.
    Made some properties private.

New Features

    New delegate methods to specify line color and alpha.
    New delegate methods that notify the delegate when the graph starts and ends updates.
    Added new calculation methods to calculate the graph's sum, average, standard deviation, median, mode, and more.
    Added a new graph snapshot method which efficiently captures a UIImage of the graph.
    Updated Sample App to reflect new features and changes.
    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.

Fixed Issues

    Added call to super in layoutSubviews.
    The reloadGraph method now calls setNeedsLayout instead of directly calling layoutSubviews.
    Improved memory performance with @autoreleasepool blocks.
    Added Type-Safety for 64-bit architecture.
    Fixed X-Axis layout issues.
    Fixed typos.

Optimized the way the labels are displayed on the X-Axis

The labels on the X-Axis are now offset to be centered if necessary and
possible.

v1.2.2

Replaced direct call of "layoutSubviews" by "setNeedsLayout".
Got rid of the extension .md of the "LICENSE" file for CocoaPods.

v1.2.1 - Getting project ready for CocoaPods

- Renamed the folder "BEMSimpleLineGraph" to "Classes".
- Modified the documentation to reflect the change of name.

Merge branch 'master' of https://github.com/Boris-Em/BEMSimpleLineGraph