Allow numbers starting with decimal in fast_atof.
Allow several spaces between numbers in OBJ files.
Don't use isdigit() in fast_atof.
Don't use isspace() in OBJ file parser.
Add test OBJ containing various number formats.
Add test OBJ w/ multiple spaces between elements.
Merge pull request #316 from tgnottingham/master

Allow numbers starting with decimal in fast_atof. Allow several spaces between numbers in OBJ files.