make adding nuggets restful:
 * create home() at url '/' that redirects to nuggets
 * move code from add_nuggets() to nuggets()
 * get and post from same url to get and add nuggets
 * update tests and show_nuggets.html
 * redirect to home after login/logout
make searching for nuggets restful:
 * use http GET for search instead of post
 * add TestWeb.test_search_nuggets
 * update show_nuggets.html template
 * move code from find() into nuggets()
make updating/deleting nuggets more RESTful:
 * couldn't use PATCH or DELETE from html form so will use POST
 * add nugget method to handle GET and POST on /nuggets/<nugget_id>
 * update templates and tests for new URL's
rename nugget -> meme everywhere (tests not passing though)
update memes.html because it got missed in last commit (tests now pass)
add some stub tests for later
allow title (non-url) based memes, use title for meme.id when no url