Changes pertain to app creation page, specifically app name with namespace input fields

- Remove font-family because (a)it's causing a weird height descrepency issue on FF and (b)it's superfluous
- Change explicit height to min-height. It was part of several issues that were causing the input and .add-on's to have different heights at different browser widths.
- Adjust width between label and controls at <979px width, because of horizontal scroll.
- Apply min-height at <767px so .control-group-important elements have consistent heights.
- input-block-level mixin needs slightly taller min-height to account for descrepency on FF at mobile res. I believe this is because of changes to our base font-family, font-size, and line-height.
- Reapply span3 (same as prod) to control both input widths at specific browser widths.