upgrade prettydiff; revert js-beautify

accidentally updated jsbeautify before; needed to update prettydiff.

package.json

@@ -84,13 +84,13 @@
     "extend": "^3.0.0",
     "gherkin": "2.12.2",
     "handlebars": "^4.0.2",
-    "js-beautify": "^1.6.1",
+    "js-beautify": "^1.5.7",
     "jscs": "^2.1.1",
     "lodash": "3.10.1",
     "loophole": "^1.0.0",
     "node-dir": "^0.1.8",
     "node-uuid": "^1.4.3",
-    "prettydiff": "^1.16.0",
+    "prettydiff": "^1.16.1",
     "season": "^5.3.0",
     "space-pen": "^5.1.1",
     "strip-json-comments": "^1.0.2",