Remove bootstrap CSS files and use debian package instead

- Add depedency on libjs-twitter-bootstrap
Remove bootstrap JS files and use debian package instead
Remove unused make steps for custom minifing CSS
Move CSS embedded into pages to a separate file
Update firewall page styling
Fix minor styling issue in router setup page
Remove erroneous onload javascript

If a page needs to run javascript on load, it is easy to do so by attaching 
onload handlers or by using corresponing jQuery utilities. There is no need
to mess with templating.
Cleanup menu generation using templates
Remove unused JS files
Merge pull request #78 from SunilMohanAdapa/bootstrap-cleanup

Bootstrap cleanup