Fixed issue #3 and #6

- Added exception to fix issue when only one point is drawn (issue #6).
- Added exception to fix issue when all of the points have the same
value (issue #3).
- Added define padding to replace hard coded number.

Thank you to @darkFunction for the help with the fix of issue #3.
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.
Fixed typos in READNE.md
Update README.md

Added link to Gitter for support/discussions.
Readme Update

Removed feature warning.
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.
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).
Update README.md
Minor bug fixes

- Fixed typo in comment
- Added if statement to avoid crash
- Checked the Target Membership in Storyboard to fix issue #14. Thank
you @maxydon.
Merge branch 'master' of https://github.com/Boris-Em/BEMSimpleLineGraph
Support of graphView in UIScrollView

Thank you to @nmattisson for this addition to the graph. See issue #12.
Bug fix

- Fixed bug with fill background. See issue #15. Thank you to
@rootilein for pointing this out.
Bug fix about touch vertical line

Fixed bug from issue #18. The vertical line (when touch is enabled)
doesn't go outside of the frame of the graph any more. Thank you to
@FrederickGeek8 for spotting the issue.
Bug fixes & new properties

- Changed the padding for the graph, fixing issue #20. Thank you to
@tgodier.
- Added public properties `sizePoint`and `colorPoint` to control the
diameter and color of the points creating the graph.
- Updated README to reflect these changes.
Update README.md
Added support of PopUpReport

New feature: when the user touches the graph, a label will show up
above the closest point giving the value of this point.
Cleaned up
Update README.md
Update README.md
Merge pull request #25 from Boris-Em/master

Feature branch catch up on Master branch