2-spaces indentation, added vendor folder with README.md, updated Gruntf...

I added the 2-space indent we agreed upon, and also provided the vendor folder with Grunt support. In the last week, I had to manually add two libraries (JS and JS/CSS) manually, and it's not a no-brainer when there is no bower support, as there may be more to come. I agree with you diegonetto that libs should be added through bower, but sometimes there is no support for bower. Perhaps it won't be needed in the future, but at the moment I use it with http://momentjs.com/ (min + lang version, provided by bower but not possible to include via bower) and https://github.com/driftyco/ionic-contrib-frosted-glass which is not provided by bower.

I added a README.md file to the folder, that provides arguments for it's addition :) and also easy instructions on how to use it.