overhauled fab/aws deployment: can now deploy with `fab app_server deploy_app_server

fixed missing ~/.aws directory bug
updated outdated boto aws commands: terminate_instances, remove_section
added ability to setup a node environment to install node dependencies (ie. lessc)
install node dependences via `sudo npm install -g' (from package.json is avail)
fixed bug with distribute installation
run syncdb before running migrate for database
added command for destroying aws instance: destroy_app_server