chore: bump DevTools.Web to 0.3.0

 - updated curl, nodejs from 0.8 to 0.10, git extensions
 - this also fixes install bug for 'contents' folder as gitextensions
   version was wrong  -- 2.4.4 really installed 2.4, which had a
   content folder -- it should have been 2.44, and is now 2.46
 - updated posh-github, firefox to 22, dart editor to latest
 - ConEmu has been updated to a newer version that can be
   better customized
 - added EthanBrown.ConEmuConfig