create post spec and added index test
added index method
added index view
added post factory and show test
renamed spec files
added show method, set_post method, and post_params methods
added post show view
added another show test
added edit test
added edit method
added edit view
added edit test for template
added test for new
added new method
changed textarea to the correct text_area
created new template
added submit button
added create test
added create method
added test for redirect