add option to set the primus ldpath, and use it when using the primus bridge - primusrun is no longer needed
add PrimusLibraryPath to bumblebee.conf
add bash completion for --primus-ldpath
Merge pull request #363 from ralfjung-e/master

Do not use primusrun, load primus library directly
Merge branch 'master' into develop

Conflicts:
	src/optirun.c