Merge pull request #217 from p/notifier-documentation

HTTP notifier documentation
rake html target for html documentation
Fix integrity.css rake task
Move faq to be before support/contributing, this makes more sense to me
Revert "moved htmlize and integrity.css to integrity.github.com"

This reverts commit 2fc097a6486b75df6fcf762ea28a01c53d2dcf3b.
Update issues url to github issues
Updated stylesheet from integrity.github.com repository
Update rakefile to build all files for documentation html
Add a section on documentation generation to integrity.txt