Improved gulpfile.js
Improved gulpfile.js

- Extract paths into a constant.
- Automatically set NODE_ENV = 'production' in production mode.
- Remove console.log calls in favor of gulp-util.log.
- Renamed tasks: 'js:vendor' => 'bundle:vendor', 'js:app' => 'bundle:app', 'css' => 'bundle:styles'.
- Merge 'index, icons, favicon' tasks into a single 'static' task.
- Remove 'minify', 'js:uglify' and 'css:minify' tasks.
  Their functionality was moved to appropriate tasks and works in production mode only.
- Remove 'build' task in favor of 'bundle' task, which builds application in production mode.
- Improved rebuilding perfomance by using watchify.
- Other little changes.

Kilte/scrobbler,Kilte/scrobbler,Kilte/scrobbler