start posts controller
begin tests for posts controller
factories for testing
index test
views for posts
test for posts#index
empty view for new post
;
test for posts#new
begin testing create
add show method
blank view for a post
blank view for post edit
test for  edit
test for update
test for destroy
delete factories
assign current category to instance variable
view for all posts by category
form for new psot
form for showing a single post