navigate to the promised land (bug 1059002/1059528)

An attempt to resolve some pain points about the navbar.

- [Screencast in action](http://screencast.com/t/LXWawCRn)
- Magic math involved
- Swiping has been removed
- Line-fitting in some cases where the next page link is initially not visible [Screencast](http://screencast.com/t/tSa3VWDLNtx)

TODO: use transforms instead of right