restructuring the API slightly based on feedback from Jeena
pumping the version number
adding string stripping for p- properties

I'm not really happy with this code: this sort of thing should be
abstracted by the HTML/XML library.

Kartik has suggested we switch to BeautifulSoup. it was a bit hacky last
time I looked, but if it reduces this kind of thing, I'd be in favour.
releasing version 0.1.3
merging, and fixing string strip
updating setup.py and README for 0.2.0 release
Merge pull request #40 from tommorris/master

updating from tommorris
Merge pull request #39 from kylewm/master

Bugfix for nested datetimes & Implied date for dt-* properties