Ignore www/lib files on git

Rely on bower to install these dependencies.
Add wiredep to automatically inject bower dependencies

Javascript and CSS from bower.json dependencies are automatically injected into index.html
Add injector for local (non-vendor) dependency injection

Gulp task named `dependencies` runs both gulp-injector and wiredep. Thus, vendor and non-vendor are automatically injected into index.html. Dependencies included in ionic.bundle are ignored in wiredep.
Add application configuration module

Angular initialization into config.js and application.js. Add basic `modules` scaffold.