2.0.0-a5

• Added em, rem, and percent functions globally
  • Need to test with bourbon to make sure em and rem behave
• Added font-size mixin globally that generates the converted font size based on the pixel size. This mixin automatically filters out which method to use based on your global/project config. It will also add the px fall back depending on your settings
• Began converting all the font sizes to relative units instead of absolute units with rem as the default.