chore(svg): add country flags

Country flags were retrieved from wikipedia with the util `get_flags.sh`
chore(css): add bootstrap css files
chore(img): add favicon
chore(angular.min.js): update to angular v1.2.7
feat(app.js): create countdown controller
chore(js): add bootstrap js file
chore(fonts): add font groups (woff files)

Fonts added:
* OpenSans-Regular.woff
* OpenSans-Semibold.woff
* glyphicons-halflings-regular.woff
feat(index.html): add countdown ng-controller