Email activation links [MJ-897]

- Turn normal activation link into a button
- Add activation/view buttons to initial saved search emails

Should the view button be modified? If a user is active, the confirm and view buttons go to the same place.

All tests pass.

Initial saved search
![2014-06-18-113058_605x590_scrot](https://cloud.githubusercontent.com/assets/3379265/3316043/f4e3cad6-f6fe-11e3-8e54-9d7dc0f91909.png)

Activation
![2014-06-18-114945_598x164_scrot](https://cloud.githubusercontent.com/assets/3379265/3316209/53a64728-f700-11e3-9321-aeeb7101e49a.png)