un_escape the mag urls

apps like transmission don't like the %lblablablab values in urls.. so unescape them.

Not sure if this works :D
Don't url_encode the magnet link

Which means not using the helpers.  But apparently if you follow
the the link to Transmission the %3F confuses it and won't actually
load.  Hopefully this is better.
Merge branch 'qbit-master'

resolves #2