Fixing osext import path
Fixing osext import path

Its moved from bitbucket to github on 22. of febr
see: https://bitbucket.org/kardianos/osext/src/816c96ec6fef6a0cd72c9395d192c4bd0d918753/osext.go?at=default#cl-6

progrium/go-basher,michaelshobbs/go-basher,michaelshobbs/go-basher,progrium/go-basher