rename call for speakers to match what we are using in tweets
change the submit link to a call to action instead of "click here"
replace "user name" with "username" as it more commonly accepted

e.g. http://english.stackexchange.com/questions/43436/username-user-name-or-user-name
tidy up the login page

- remove lots of redundant text
- restyle the page
- change the order of login ways to give preference to oauth
style the registration page, and add a registered page for success
tidy the submit session page, and add some styles
restyle the delete session page
change the unknown gravatar image to the mystery man, and deal with missing email addresses
add some admin actions to the session details page
split the profile management out into a separate controller
split the models out into separate files
split the profile, change password and logins stuff from the large account page
add a link/prompt on the registration success page to the edit profile page
only capitalize the first letter of labels, instead of sentence case
add name and email to the registration page
several changes to the sessions pages

- add a banner at the top of some pages
- extract the session display out into a shared view
- sort the sessions by name, with the current user's sessions at the top

TBH, these got a bit tangled together, so I can't really commit them separately
switch the github logo for a better one
add the twitter js as a bundle
ensure the twitter js is loaded
make more code use the standard formatting of sessions, including the tweet button