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

+ 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
Restores hover state to mode buttons
Fixes line height of detail header so descenders aren't obscured
Merges in changes from master
Adds margin, renames ui style, and adds no-border option
Adjusts line height of subsection header to avoid cropped descenders
Removes extra padding from the top of settings forms
Merge pull request #817 from sonatype/8shapes_nested

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