Ansible-tower-cli

* Fixed a bug which blocks named resources from using runtime configure settings.
* Fixed a bug in 3.1.0 which sometimes causes traceback when pk value is given.

* Improved job monitoring functionality to enable standard out streaming, which displays real-time job output on command line.
* Added workflow, workflow_job and node endpoints to manipulate workflow graph and manage workflow job resources. Reflecting workflows feature of Tower 3.1.
* Added settings command to manage Tower settings via Tower CLI. Reflecting Configure Tower in Tower (CTiT) feature of Tower 3.1.
* Included timeout option to certain unified job template resources. Reflecting job timeout feature of Tower 3.1.
* Added unicode support to extra_vars and variable types.
* Several minor bug fixes to improve user experience.

Update to enable configuring tower-cli via environment variables.

Several issues mentions demand for this functionality, so we make it a separate patch.
- Custom SSL certificate support added
- `docs/CONFIG_CMD_OPTIONS.md` added as a reference for all available configuration parameters.

- Added text indicator for resource change
- Allow hosts, inventory, and groups to use variables from the command line
and denote a file by starting with ""
- Added resource role for tower3.0 and permission for previous tower versions
- Added notification templates
- Added labels
- Added description display option
- Added deprecation warnings
- Help text upgrades
- Give indication of "changed" apart from color
- New credential fields to support openstack-v2, networking and azure
- New options for inventory source/group. Add implicit resource inventory
script.
- credential updates (no longer require user/team)
- Added support for system auditors
- projects (do not post to organizations/N/projects)
- prompt-for JT fields + job launch options (allow blank inventory too)
- Update the POST protocol for associate and disassociate actions
- New job launch option for backwards compatibility
- New tower-cli option to display tower-cli version
- Enhanced debug log format (support multi-line debug log)

- Add RPM specfile and Makefile
- Tower compatibility fixes
- Allow scan JTs as an option for "job_type"
- Add ability to create group as subgroup of another group
- Add YAML output format against JSON and humanized output formats
- Add SSL corner case error handling and suggestion
- Allow resource disassociation with "null"