Web Starter Kit v0.4.0 and some other stuff

Hey! Thanks for the great project.

I found it very useful and modified a few things

+ Added a .gitignore
+ Updated Web Starter Kit resources, scripts etc. to v0.4.0
+ Brought back the main.js file so the hamburger slide works properly
+ Created a .bowerrc file so you can run `bower install` from the root directory like `npm install`
+ Updated the readme to reflect all of this

The new `gulp serve:dist` command doesn't work, I presume it's a problem with minifying angular code but I'm not sure.