RLS: VERSION.txt: 0.5.1
Merge branch 'release/0.5.1'

* release/0.5.1:
  RLS: VERSION.txt: 0.5.1
  DOC: usage.rst
  RLS: MANIFEST.in: autogenerated git_manifest
Merge tag 'v0.5.1' into develop

RLS: dotfiles v0.5.1

* tag 'v0.5.1':
  RLS: VERSION.txt: 0.5.1