fix tests for "web" app
add listing for podcasts w/ license information
set TEMPLATE_CONTEXT_PROCESSORS in a forwards-compatible way

the defaults may change over time, so they shoudn't be hard-coded in the
configuration.
extract common template skeleton
redirect users to pervious page after login
use table-row grouping also for device list
extract podcast-base template from podcast template
move subscription history to separate page
refactor subscriptions on podcast page
fix color of caret in subscribe drop-down
create episode-box component
update bootstrap, font-awesome
fix base font-family
add episode pagination to podcast page
fix pagination on history page
add Flattr button to btn group on podcast page
fix url of subscription history page
refactor episode page
add "Docs" section in menu
remove "well" from sidebar navigation