Added embed(), breadcrumbs(), jumbotron() and listgroups()
updated listgroup()
Updated media()
Added mediaList()
Added a "Fork me!" button on the demo page
- Added nav() and navItem()
 - Removed useless HTML anchors in demo
 - done some fixes in methods.
Closes #11, working on #10, started navbar()

This is a big commit wich changes the way the options and attributes are handled in methods.

It should still work as before, expect some small changes in your options.
Added well(), progressbar() and begining of navbar()
Added panel()
Changed panel classes of demo panels to work with panel() examples.
Added pagination() and panel()

Added holder.js for images in demo.
Merge pull request #1 from el-cms/master

Merge with master tree