starting to add support for new selectors
add .swp to gitignore
make tests mostly pass...
update docs
support for css selectors
improve comment
s/add/adds/ (because I can't type)
make repr for selectors not crash
make ::text in a WebdriverSelector work like ::text in a Scrapy Selector
Merge pull request #1 from JeffAMcGee/master

Merge changes from Jeff