Fixes issue #40: Overzealous word splitting

[ef4]

pdfkit breaks lines at the punctuation within words like "A.B.C" or "3.14159" or "1,000".

This change causes it to split only where non-whitespace runs up against whitespace.

[devongovett]

This is hopefully fixed by the new line wrapper, which implements the Unicode Line Breaking Algorithm as a separate module, removing the regex all together. Let me know if you still see problems!