Merge tag '1.5.0' into develop

Tag 1.5.0
Preparation for new development cycle after release 1.5.0
Merge branch 'master' into develop
Merge tag '1.5.1' into develop

v1.5.1
Version bump 1.6.0
Fixes merge leftover
More leftovers
Merge tag '1.5.2' into develop
Merge branch 'master' into develop
Merge tag '1.5.3' into develop

1.5.3
Merge effect
Add ability to short-circuit the version filters.

An exit of 127 will short-circuit the process.
Output when finishing a branch is wrong.

github: Fixes #102
Fix sanity check for feature track command.

The check for needed branches is incorrect for th command feature track.
This patch introduces a new function: require_local_branch_absent
Update changelog.
Version bump 1.6.0-dev.15
Merge branch 'feature/fix_feature_track_#101' into develop

Fixes: #101
Move most of configuration from ~/.gitflow_export to natural config
Move all configuration from .git/gitflow_config to "--local" conf
The configuration for the base should always be local.

Included the parameter --local to make sure it will only read and write from the local .git config file.