Put the pattern engine name in the generated pattern data block so the

UI can put it in the template tab if it's there.

Author: geoffp

core/lib/patternlab.js

@@ -339,6 +339,7 @@ var patternlab_engine = function (config) {
         patternName: pattern.patternName,
         patternPartial: pattern.patternPartial,
         patternState: pattern.patternState,
+        patternEngineName: pattern.engine.engineName,
         extraOutput: {}
       });