Brings "Reset User Tokens" form in-line with 8shapes mockups

Depends on https://github.com/sonatype/nexus-pro/pull/429

Changes:

+ Breaks dialog out of its frame
+ Left-aligns the title, body, and footer
+ Removes background color from all save/discard toolbars across the app
+ Left-aligns the save button with associated content across the app

In addition:

+ Restores the hover state for mode buttons
+ Fixes the line height of detail headers (so descenders aren’t cropped)

Before:
![before](https://cloud.githubusercontent.com/assets/186715/4745499/110bd2ae-5a3b-11e4-87ad-31318a17a282.png)

After:
![after](https://cloud.githubusercontent.com/assets/186715/4745500/146ccf20-5a3b-11e4-80d4-6ee37b7ba50e.png)