Fixed creation of UIColors with format rrggbb 

The first character was always stripped from the format:
If someone passed a color without a leading # (for example FF0000),
the first character was removed, so most of the red part of the color
was lost (for the example the color would be F0000 = 0F0000)
Merge pull request #115 from tammofreese/patch-1

Fixed creation of UIColors with format rrggbb