Optional typography improvements

[dreikanter]

Required features:

• prevent widows
• long words hyphenation
• nbsp before short words.

Everything could be implemented inside markdown postprocessor for text blocks.

No need to replace quotes or dashes.

[dreikanter]

• https://github.com/chrisdrackett/django-typogrify
• http://jeffcroft.com/blog/2007/may/29/typogrify-easily-produce-web-typography-doesnt-suc/
• http://net.tutsplus.com/tutorials/html-css-techniques/six-ways-to-improve-your-web-typography/

[dreikanter]

This one is better: https://github.com/sapegin/richtypo.js