winetricks dotnet30 install seems to be working again

[Dan Kegel]

For me, with today's winetricks from svn and wine from git,
  winetricks dotnet30
seems to work well.  It appears to hang at the end because of
http://bugs.winehq.org/show_bug.cgi?id=25059
but that's cosmetic; if you look for the icon hiding on the
taskbar, you'll see the installer completed.

Don't know if the resulting package works, but at least
it installed for me just now once.  Ship it!  :-)