Poems index page with search functionality, json builder templates and JS Poem class
Add jbuilder for users#user_page in order to render JSON and append it to the user's page using the JS functions instead of through a haml view
Add poem and reading rendering to user page using existing JS functions
jbuilder JSON rendering of reading has @link_poem boolean that will cause it to send URL for parent poem with the JSON so that readings can link to their poems from the user page (but not from the poem page)