Bump version to 0.9.1

Change-Id: b29ce0b4a3
Make sure grep is not exploding `feature start`.

If there were no `unscheduled` stories, grep would return an error code and
`set -e` would do it's thing.

Change-Id: 6c6c954c17
Story-id: 78883220
Rename gitflow.yml to salsaflow.yml
Fix repository renaming issues, part I
Add release.sh

This script can be used to build the Go part of SalsaFlow and upload it
to the specified GitHub release. It must be invoked from the top level
directory and it is expecting the repo to be cloned inside of a Go
workspace.
config: Use salsaflow.yml file name

Instead of gitflow.yml that was being used up until now.
install.sh: Ensure that master branch is used