Use Mustache-insipired template tags.

Underscore's default ERB-style templates are incompatible with PHP when asp_tags is enabled. As a result, we've settled on an alternative syntax that should be familiar to devs: Mustache-inspired for interpolating and escaping content, and ERB-inspired for execution.

	`{{{a}}}` - interpolating
	`{{ a }}` - escaping
	`<# a #>` - execution

props rmccue. fixes #22344, see #21390.


git-svn-id: https://develop.svn.wordpress.org/trunk@22415 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/js/media-models.js

@@ -58,9 +58,15 @@ window.wp = window.wp || {};
 		 * @return {function}    A function that lazily-compiles the template requested.
 		 */
 		template: _.memoize( function( id ) {
-			var compiled;
+			var compiled,
+				options = {
+					evaluate:    /<#([\s\S]+?)#>/g,
+					interpolate: /\{\{\{([\s\S]+?)\}\}\}/g,
+					escape:      /\{\{([\s\S]+?)\}\}/g
+				};
+
 			return function( data ) {
-				compiled = compiled || _.template( $( '#tmpl-' + id ).html() );
+				compiled = compiled || _.template( $( '#tmpl-' + id ).html(), null, options );
 				return compiled( data );
 			};
 		}),