Miscellaneous changes

TODO changes for this PR as proposed by @smcgregor :
1. rename extension to just "Privly"
2. move the tests directory into the javascripts directory
3. drop pages.css
4. clean up extra whitespace from files
5. cleanup the background.html file (it should not have "test cases" in it)
6. run file through JS Lint and cleanup as appropriate
7. put HTML files onto a validator and cleanup as appropriate