instantiate user only when submitting registration

tasx-7
access fields directly

tasx-7
save authenticated user in session

tasx-7
put repeated html in template

tasx-7
add html language attribute to user views

tasx-7
use twitter-bootstrap plugin

tasx-7
replace tables with bootstrap form

tasx-7
disable user scaffolding

tasx-7
add links to registration and login pages

tasx-7