Handle '@' symbol in ssh username

http://youtrack.jetbrains.com/issue/IDEA-123890
Git pull doesn't work if git username has 'at' symbol
Karma auto-rerun tests shouldn't activate Run toolwindow
Merge pull request 191 from suman-ganta for IDEA-123890
better name: reuseActivation -> reuseToolWindowActivation
Merge remote-tracking branch 'origin/master'
http://ea.jetbrains.com/browser/ea_problems/57321
http://ea.jetbrains.com/browser/ea_problems/57321