Changed regex of ID pattern

Allowing _, -, / and .
Merge branch 'master' of https://github.com/andfinally/Adbusters
Merge pull request #16 from andfinally/master

Changed regex of test of ID param
Add XSS guidelines to readme
Merge pull request #18 from athletics/readme

Add XSS guidelines to readme
Merge remote-tracking branch 'upstream/master'