add ng-cloak to docs to prevent show brackets when angular is not loading.
add ng-cloak to docs to prevent show brackets when angular is not loading.

van-nguyen/nya-bootstrap-select,kozer/nya-bootstrap-select,jca258/nya-bootstrap-select,van-nguyen/nya-bootstrap-select,iejay/nya-bootstrap-select,jpmckearin/nya-bootstrap-select,lordfriend/nya-bootstrap-select