First pass at cleaning up HTML for the Dashboard

- Replaced incorrectly used header tags with the correct header, div,
  or span tags.
- Added right chevrons to the filter panels. They do not rotate yet.
- Added a 'Select All' option under each filter. Doesn't function.
- Integrated changes from dashboard.erb with the dashboard.hbs
- Adjusted styles to look more like the mock-ups and reflect changes to
  the markup.
- Switched from tooltips to popovers to increase readability. Still needs
  some more styling, etc.
- Combined redundant main heading classes to simplify html and styles.
- Initial sort of styles into two separate files
    - bootstrap3.less contains our themed bootstrap styles and semantic
      classes that use bootstrap mixins (.make-xs-column, etc.)
    - styles.css.less contains all 100% custom styling, including custom
      styles applied to semantic classes
- Added in correct classes for missing icons to show up.
More LESS cleanup

- Separated out h tag styles into bootstrap3 file since they are part of
  the theming - assuming styles will remain consistent for h1, h2, and h3
  across the other pages.
- Resolved problems with popover font styles.
- Converted font-size to use ems, except for popover-content and the
  measure title because of an inheritance bug where it gets size and
  weight from the outer element.
- Switched circles to using variables for the radius so you can change the
  radius and the width and height will scale appropriately.
- Cleaned out more lines of CSS that change nothing or are redundant.
- Made the measure class make sense semantically.
- Fixed vertical alignment of elements in the nav bar.
- Minimized the number variables being used in the custom styles file.
- Spacing is even between all the % circles and the category headers.
Updated Account Dropdown in new header/nav bar.

- Removed sub-dropdown for admin options.
- Updated a couple of the icons to more useful ones.
- Removed the styles for sub-dropdowns from bootstrap3.less