Adding Prefix To all Leap Atom Classes

[thinmatt]

In an effort to make the Leap name scheme more unique and provide the ability to more easily drop leap into an existing application without conflicts, I am adding a prefix to all leap classes. The prefix will have a variable so it can be easily adjusted if need be. Defaulting to .thl for now which stands for Treehouse Leap.

Atom To Dos:

• Block Grid
• Border
• Buttons
• Colors
• Display
• Flexbox
• Float
• Forms
• Grid
• Icon
• Margin
• Overflow
• Padding
• Position
• Rotation
• Table
• Type
• Vertical Alignment
• Widht & Height

General To Dos:

• Audit style guide pages for proper use of classes with prefix
  • Index
  • Getting Started
  • Sass
  • Responsive
  • Atoms Pages
  • Release Notes
• Check in on Icon Helper/Name scheme to determine if we should prefix