Documentation updates for clueless newbies like myself

[spacemonkey]

Following are just notes I took while setting up a clean, bare MEAN last night. I'm happy to help with the documentation if needed - let me know and I can fork and then issue pull requests, if that is what you guys like.

• Grunt is a dependency and should have instructions ("npm install -g grunt-cli"). Might require superuser privileges too.
• In order to use grunt, you also need to have ruby and compass installed - which need to be listed as dependencies for grunt.

[amoshaviv]

duplicate of #17 working on documentation, thank you for your patience