update bower version and dependencies

bower.json

bower_components/bootstrap/.bower.json

bower_components/bootstrap/Gruntfile.js

bower_components/bootstrap/README.md

bower_components/bootstrap/bower.json

bower_components/bootstrap/dist/css/bootstrap-theme.css

bower_components/bootstrap/dist/css/bootstrap-theme.min.css

bower_components/bootstrap/dist/css/bootstrap.css

bower_components/bootstrap/dist/css/bootstrap.css.map

bower_components/bootstrap/dist/css/bootstrap.min.css

bower_components/bootstrap/dist/js/bootstrap.js

bower_components/bootstrap/dist/js/bootstrap.min.js

bower_components/bootstrap/grunt/bs-lessdoc-parser.js

bower_components/bootstrap/grunt/configBridge.json

bower_components/bootstrap/grunt/sauce_browsers.yml

bower_components/bootstrap/js/affix.js

bower_components/bootstrap/js/alert.js

bower_components/bootstrap/js/button.js

bower_components/bootstrap/js/carousel.js

bower_components/bootstrap/js/collapse.js