Add link to last-viewed microsite, if it's not www.my.jobs [MJ-648]

Truncates the microsite name so that the truncated name plus '...' are 32 characters long, which is the max that will fit in the available area.

Also replaces the href for both 'Search Jobs' links with the last-visited microsite, if one exists.

Logged in:
![2013-11-08-140814_975x43_scrot](https://f.cloud.github.com/assets/3379265/1503326/7bb44194-48a9-11e3-88fa-4353eb08a787.png)

Logged out:
![2013-11-08-140750_964x36_scrot](https://f.cloud.github.com/assets/3379265/1503325/7a278476-48a9-11e3-9f45-0694cff50500.png)

All tests pass.