Bump to version v0.9.1

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)

Conflicts:
	VERSION
Change version to 0.9.1-dev

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #4855 from unclejack/update_release_v0.9.1

Update master for release 0.9.1