Email Reset and Switcher improvements

Made the reset email a little more clear. Also made it so admins can't
access the section switcher and get a 500 error.
Got rid of duplicate templates

Made a `BioPublicBundle:Template:…` folder containing a blank template
for downloading and a single form template for any pages that only
require a single form. Replaced duplicates with those.
Trip fixes

Made some style changes
Better rendering of trips using a macro
Fixed bug where you could join a trip with the right url
Better email command