#706 remove Foundation/scss, add Bootstrap/LESS

- rewrite and style base template and homepage
#706 rewrite styles for worksheet list page

- convert worksheets.css to LESS
- add color variables
Merge branch 'refs/heads/feature/worksheet_interface' into feature/706-bootstrap
Worksheet detail markup and styling

- convert ems to px
- also fixed navbar collapse
- add Segoe font files
- convert glossary modal
- improve quality of header logo
#706 Add {% active %} tag for nav

- rewrite and style login, signup, password reset pages
- style collapsed navbar
- clean up cl-variables a little
#706 rewrite and style bundle details and filebrowser, fix responsive tables on worksheet details
#706 settings, competitions

- rewrote and restyled settings page
- rewrote and restyled competition list
- began work on competition-view
#706 Competition view page

- rewrote tab and innertab navigation
- recreated table styles
- cleaned up markup
- rewrote javascript to work with new tabs and markup
- added more mixins for phase color list items, panels, buttons
#706, #702

- rewrote markup and styled:
 - My Competitions page and tabs
 - Upload competition process and messages
 - Competition participants page
#706 My Datasets and Create Dataset flow

- also changed secondary button to primary button, because it's used almost everywhere
#706 search results page, edit competition form
#706 Submissions page, submissions table, delete submissions page
#706 competition submit results page
#706 consistency of phase description header, remove some obviated js
Merge pull request #723 from codalab/feature/worksheet_interface

updating from worksheet interface
Merge pull request #724 from codalab/feature/706-bootstrap

Moving over to Bootstrap framework for front end and CSS
Automatically go to the active phase in the Participate and Results tabs of a competition
Merge pull request #731 from codalab/feature/706-bootstrap

Automatically go to the active phase in the Participate and Results tabs
Bootstrap conversion regression fixes

- Clean up display of many competitions on /my
- Fix whitespace between competition tiles on same
- Fix display of images within html page sections of a competition
Merge pull request #732 from codalab/feature/706-bootstrap

Bootstrap conversion regression fixes