added usage of pyprepfnt & sanitized the base font after injecting bundle

-added output folder option
-parsing of arguments improved
-sanitized the base font after injecting bundle
-removed glyphs not in the font from the text
-refactoring of the constant name ( white space glyphs)
the interesting part for this code is they are 'completely invisible (and non advancing, i.e. "zero width")' http://www.unicode.org/faq/unsup_char.html

if you think whitespace is not enough then how about whitespace_and_ignorable_list?