fix(config.get): process intermediate templates in path

lib/grunt/config.js

@@ -43,7 +43,28 @@ var propStringTmplRe = /^<%=\s*([a-z0-9_$]+(?:\.[a-z0-9_$]+)*)\s*%>$/i;
 
 // Get config data, recursively processing templates.
 config.get = function(prop) {
-  return config.process(config.getRaw(prop));
+  var props = getParts(config.getPropString(prop));
+  var currentData = config.data;
+  // from https://github.com/cowboy/node-getobject/blob/master/lib/getobject.js
+  // Split strings on dot, but only if dot isn't preceded by a backslash. Since
+  // JavaScript doesn't support lookbehinds, use a placeholder for "\.", split
+  // on dot, then replace the placeholder character with a dot.
+  function getParts(str) {
+    return str.replace(/\\\./g, '\uffff').split('.').map(function(s) {
+      return s.replace(/\uffff/g, '.');
+    });
+  }
+
+  props.forEach(function(item) {
+    currentData = currentData[item];
+    // if current value is template -- expand it
+    if (typeof currentData === 'string' &&
+      currentData.match(propStringTmplRe)) {
+      currentData = config.process(currentData);
+    }
+  });
+
+  return config.process(currentData);
 };
 
 // Expand a config value recursively. Used for post-processing raw values