Making (some) char* parameters const
Removed nonexistant function stubs
Fix markdown link
Merge pull request #5 from msoucy/master

Making (some) char* parameters const
fixed a few compiler warnings about vasprint, and shadowed variables
reorganized the header file and the source file in order to hide functions and structures that the end user doesn't need to worry about
Moved more non-user facing functions from the header into the source
Changed the api for apply_format, it has been renamed to apply_color so it won't be confused with make_format
Rough first attempt at porting the image drawing code.
A lot of this is ripped almost directly from fabulous which
made it pretty easy, hardest part was figuring out imagemagick.
added a test c file
Fixed a mistake, this will now actually compile
Updated test.c for the new apply_color api