Update & Refactor

[markrickert]

I did a lot of refactoring in this branch... converted all the methods into a global invoke method that takes a hash of data and sets defaults.

• Updated SVProgressHUD to 1.1.3
• Added ability to show an arbitrary image
• Added Motion::Blitz.visible? to see if the HUD is being displayed
• Added the new "info" style
• Added global style setters - backgorund_color=, foreground_color=, font=, info_image=, success_image=, error_image=, default_mask_type=.
• Added some associated style getters
• Added some basic tests as well as a .travis.yml file for automated testing on github.

Let me know what you think :)