Merge branch 'master' into v4

Conflicts:
	_config.yml
	dist/css/bootstrap-theme.css
	dist/css/bootstrap-theme.css.map
	dist/css/bootstrap-theme.min.css
	dist/css/bootstrap.css
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
	dist/js/bootstrap.min.js
	docs/_includes/components/thumbnails.html
	docs/_includes/css/forms.html
	docs/_includes/css/grid.html
	docs/_includes/customizer-variables.html
	docs/_includes/footer.html
	docs/_includes/getting-started/download.html
	docs/_includes/getting-started/template.html
	docs/_includes/js/overview.html
	docs/_includes/js/popovers.html
	docs/_includes/js/tooltips.html
	docs/assets/css/docs.min.css
	docs/assets/js/customize.min.js
	docs/assets/js/raw-files.min.js
	docs/assets/js/src/customizer.js
	docs/dist/css/bootstrap-theme.css
	docs/dist/css/bootstrap-theme.css.map
	docs/dist/css/bootstrap-theme.min.css
	docs/dist/css/bootstrap.css
	docs/dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.min.css
	docs/dist/js/bootstrap.js
	docs/dist/js/bootstrap.min.js
	docs/examples/navbar-fixed-top/index.html
	docs/examples/navbar-static-top/index.html
	docs/examples/non-responsive/index.html
	docs/examples/theme/index.html
	grunt/configBridge.json
	less/alerts.less
	less/badges.less
	less/jumbotron.less
	less/panels.less
	less/tables.less
	less/theme.less
	less/variables.less
	package.json
	scss/_button-group.scss
	scss/_buttons.scss
	scss/_forms.scss

Gruntfile.js

@@ -315,6 +315,7 @@ module.exports = function (grunt) {
           build: process.env.TRAVIS_JOB_ID,
           concurrency: 10,
           maxRetries: 3,
+          maxPollRetries: 4,
           urls: ['http://127.0.0.1:3000/js/tests/index.html'],
           browsers: grunt.file.readYAML('grunt/sauce_browsers.yml')
         }