Implement relative to project root search paths.

Author: e2l3n

lib/pbxProject.js

@@ -1650,6 +1650,10 @@ function correctForPath(file, project, group) {
 }
 
 function searchPathForFile(file, proj) {
+    if (file.relativePath) {
+        return '"\$(SRCROOT)/' + file.relativePath + '\"';
+    }
+
     var plugins = proj.pbxGroupByName('Plugins'),
         pluginsPath = plugins ? plugins.path : null,
         fileDir = path.dirname(file.path);