merging a variant of svieira's fix for preserving whitespace within templates.

underscore.js

@@ -625,17 +625,19 @@
   // JavaScript templating a-la ERB, pilfered from John Resig's
   // "Secrets of the JavaScript Ninja", page 83.
   // Single-quote fix from Rick Strahl's version.
-  // With alterations for arbitrary delimiters.
+  // With alterations for arbitrary delimiters, and to preserve whitespace.
   _.template = function(str, data) {
     var c  = _.templateSettings;
     var endMatch = new RegExp("'(?=[^"+c.end.substr(0, 1)+"]*"+escapeRegExp(c.end)+")","g");
     var fn = new Function('obj',
       'var p=[],print=function(){p.push.apply(p,arguments);};' +
       'with(obj||{}){p.push(\'' +
-      str.replace(/[\r\t\n]/g, " ")
-         .replace(endMatch,"\t")
+      str.replace(/\r/g, '\\r')
+         .replace(/\n/g, '\\n')
+         .replace(/\t/g, '\\t')
+         .replace(endMatch,"✄")
          .split("'").join("\\'")
-         .split("\t").join("'")
+         .split("✄").join("'")
          .replace(c.interpolate, "',$1,'")
          .split(c.start).join("');")
          .split(c.end).join("p.push('")