Feature/fullcircle

[asyrjasalo]

• Add CircleCI running make all_github for all branches (including PRs).
  • black test build install atest
• Add separate make install_e to install package with pip install --editable .
• Change make install to install package with pip install --user . instead
• Use a prebuilt Docker image (asyrjasalo/mountebank) for mountebank
  • Already has the testapi files included - in case volumes are not available on OS perms.
  • The image is built with: https://github.com/asyrjasalo/mountebank
• Improve check if Docker daemon is running on background, thus if Docker can be used
• Fix a a few bugs left in docker/ build_and_run and tag_and_push scripts