Added missing dependency to package.json

Author: DaftMonk

templates/common/_package.json

@@ -10,6 +10,7 @@
     "cookie-parser": "~1.0.1",
     "express-session": "~1.0.2",
     "errorhandler": "~1.0.0",
+    "compression": "~1.0.1",
     "lodash": "~2.4.1"<% if (mongo) { %>,
     "mongoose": "~3.8.8"<% } %><% if (mongoPassportUser) { %>,
     "connect-mongo": "mrzepinski/connect-mongo#2135988",