add image file to edit and new chirp forms, show chirp image if exist…

…s on show chirps page, http://houstonruby.github.io/rails_girls/04_adding_images/03_show_images.html

add image field to model and db for chirp, http://houstonruby.github.…

…io/rails_girls/04_adding_images/02_add_image_to_message.html

install paperclip in preparation for posting images, http://houstonru…

…by.github.io/rails_girls/04_adding_images/00_README.html

edit and show by author route, http://houstonruby.github.io/rails_gir…

…ls/03_messages/show_one_chirp_by_author.html

make a new chirp by author

limit chirps to those by author, http://houstonruby.github.io/rails_g…

…irls/03_messages/list_chirps_by_author.html

author names and chirps route set up, http://houstonruby.github.io/ra…

…ils_girls/03_messages/02_show_messages_by_author.html

delete a chirp added to chirp viewing page, http://houstonruby.github…

….io/rails_girls/03_messages/deleting_a_chirp.html

editing and updating a chirp, http://houstonruby.github.io/rails_girl…

…s/03_messages/edit_an_existing_chirp.html

new chirp view for form and create controller for posting chirp, http…

…://houstonruby.github.io/rails_girls/03_messages/add_a_new_chirp.html