Prefix constants in HTPressableButtonPrefs and convert to CGFloat
Prefix UIColor category methods
Fix "Belize Hole" color

#2980b9 is a blue color. #8d48ab is the purple shown in the preview.
Update "Belize Hole" color

Photoshop has a slightly different idea of what Belize Hole is.
Merge pull request #33 from a2/master

Merge pull request #33 from a2/master