test(gen): make tests more strict and DRY

Changes:
- `genFiles(ops)` creates an array of expected files based on options given
- test for generated files on every set of tests
- test for unexpected files
- use testExec to be more DRY

Exposes a bug with `client/components/socket`:
`socket.service.js` and `socket.mock.js` are not filtered.
See angular-fullstack#530

Author: kingcody

Diff for: package.json

@@ -48,6 +48,7 @@
     "marked": "~0.2.8",
     "mocha": "~1.21.0",
     "q": "^1.0.1",
+    "recursive-readdir": "^1.2.0",
     "semver": "~2.2.1",
     "shelljs": "^0.3.0",
     "underscore.string": "^2.3.3"