Ensure compatibility with CommonJS, AMD, as well as fallback on browser

[colelawrence]

This adds header and footer to support CommonJS and AMD libraries.

All tests were passed.

output:

/*!
 * ui-select
 * http://github.com/angular-ui/ui-select
 * Version: 0.12.0 - 2015-06-30T18:20:51.405Z
 * License: MIT
 */


(function(mod) {
if (typeof exports == "object" && typeof module == "object") // CommonJS
  module.exports = mod(require("angular"));
else if (typeof define == "function" && define.amd) // AMD
  return define(["angular"], mod);
else // Plain browser env
  mod(angular);
})(function (angular) {
"use strict";

(function () { 
"use strict";

var KEY = {
    TAB: 9,
    ...

}());
angular.module("ui.select").run(["$templateCache", function($templateCache) {$templateCache.put("bootstrap/choices.tpl.html","<ul class=\"ui-select-choices ui-select-choices-content ui-select-dropdown dropdown-menu\" role=\"listbox\" ng-show=\"$select.items.length > 0\"><li class=\"ui-select-choices-group\" id=\"ui-select-choices-{{ $select.generatedId }}\"><div class=\"divider\" ng-show=\"$select.isGrouped && $index > 0\"></div><div ng-show=\"$select.isGrouped\" class=\"ui-select-choices-group-label dropdown-header\" ng-bind=\"$group.name\"></div><div id=\"ui-select-choices-row-{{ $select.generatedId }}-{{$index}}\" class=\"ui-select-choices-row\" ng-class=\"{active: $select.isActive(this), disabled: $select.isDisabled(this)}\" role=\"option\"><a href=\"javascript:void(0)\" class=\"ui-select-choices-row-inner\"></a></div></li></ul>");
$templateCache.put("bootstrap/match-multiple.tpl.html","<span class=\"ui-select-match\"><span ng-repeat=\"$item in $select.selected\"><span class=\"ui-select-match-item btn btn-default btn-xs\" tabindex=\"-1\" type=\"button\" ng-disabled=\"$select.disabled\" ng-click=\"$selectMultiple.activeMatchIndex = $index;\" ng-class=\"{\'btn-primary\':$selectMultiple.activeMatchIndex === $index, \'select-locked\':$select.isLocked(this, $index)}\" ui-select-sort=\"$select.selected\"><span class=\"close ui-select-match-close\" ng-hide=\"$select.disabled\" ng-click=\"$selectMultiple.removeChoice($index)\">&nbsp;&times;</span> <span uis-transclude-append=\"\"></span></span></span></span>");
...
});

[hoetmaaiers]

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