Switching default body font to 'Helvetica', 'Arial', sans-serif.
Also adding optional CSS body classes that force the use of Roboto.
Merge pull request #477 from sgomes/material-sprint-roboto

Switching default body font to 'Helvetica', 'Arial', sans-serif.
Making caption type default to performance font (non web font)
Some fixes to the slider element, after UX review:
- Updating focus states to new visuals
- Improving rendering in Webkit and Mozilla by reducing the usage of gradients
- Much improved vertical centering of the slider track, with subpixel accuracy
Merge pull request #530 from sgomes/material-sprint-slider-review-fixes

Some fixes to the slider element, after UX review
Add initial tooltip implementation
Fix jshint
Revamping buttons, and adding flat buttons.
- Added flat buttons and made them the default.
- Restyled raised buttons according to Material Design spec.
- Merged FABs into the same SCSS file, for easier reuse.
- Minor bugfixes.
Merge pull request #536 from sgomes/material-sprint-button-revamp

Revamping buttons, and adding flat buttons.
Making the PaperButton class optional for FABs.
Also adding PaperFab--colored as a more intuitive alternative to PaperButton--colored in FABs.
Bugfix to checkbox init.
Fixing visuals for disabled buttons.
Add support for gulp-concat
Temp: add hotfix for scripts, styleguide images
Add useref blocks to build to single main.min.js file
Drop extra hamburger. Re-use nav asset.
Further revisions for build process
Add TODOS to gulpfile.
Updating palette colors.
Altering the padding for the side nav