nodejs-generator-gulp-angular: version bump 0.5.0 -> 0.5.1

  * Restore CSS wiring with wiredep
  * Fix the fast mode which was using an old version of Bootstrap
  * Stabilization of the CSS preprocessor choices
  * Bunch of Node dependencies update
  * Fix #39, #41, #42, #44, #46, #49
  * Thanks to @marani