include FactoryGirl syntax methods in rspec

# and remove unneeded comments
add site model and basic specs
add shoulda-gem
add specs for validations
use sequences in site factory for title and url
set json as default format for site-resource
add site controller and specs
add show action to sites controller
do not expose the id in the json response
add protected_attributes gem
add site creation
do not find site on index
adding update action to site controller
add simple cov gem
add destroy action to sites controller
test for content
config simple cov a bit better