chore(travis): Run bower install twice to make sure it does Like angular/angular.js is doing.
chore(travis): Run bower install twice to make sure it does
Like angular/angular.js is doing.

This is a work-around for Bower/Node.js issue (https://github.com/bower/bower/issues/830). We run `bower install` twice, as the probability of failing twice in a row is very low.

zhaokunfay/ui-codemirror,angular-ui/ui-codemirror,rbw0/ui-codemirror-merge,workato/ui-codemirror,rbw0/ui-codemirror-merge,episodeyang/ui-codemirror,zhaokunfay/ui-codemirror,episodeyang/ui-codemirror,workato/ui-codemirror,angular-ui/ui-codemirror