Watchmaker

**Summary**:

* Adds `valid_environments` option to config to allow for the restriction of environment selection

**Summary**:

* Adds enhancement to ensure `--admin-groups` parameters are lowercase on Linux systems
* Adds additional information to the `--version` flag
* Default values are now shown in help output
* scap-formula
- Incorporates content from latest DISA SCAP benchmarks
- Microsoft .Net Framework 4 STIG Benchmark - Ver 1, Rel 5
- Microsoft Windows 2008 R2 DC STIG Benchmark - Ver 1, Rel 5
- Microsoft Windows 2008 R2 MS STIG Benchmark - Ver 1, Rel 30
- Microsoft Windows Server 2016 STIG Benchmark - Ver 1, Rel 31
- Red Hat 6 STIG Benchmark - Ver 1, Rel 21
- Red Hat 7 STIG Benchmark - Ver 2, Rel 1

**Summary**:

* ash-windows-formula
- Updates Formula to Support Salt 2017.7.x and 2018.3.x
- Removed admin account rename from delta state

**Summary**:

* Adds a gitlab-ci pages config to build Watchmaker docs
* Uses new hosting location to retrieve Salt packages
* Restricts click version on py2.6
* ash-windows-forumula
- New hosting location being used for all packages
* pshelp-formula
- Removed byte-order-mark unicode character at beginning of init.sls file

**Summary**:

* No functional changes; just patches the CI/release configuration

**Summary**:

* Provides standalone packages that bundle the Python runtime together with
Watchmaker and its dependencies
- See <https://watchmaker.cloudarmor.io/en/stable/installation.html>
* ash-linux-formula
- (el7) Ensures packages are up-to-date
- (el7) Ensures firewalld is installed and running
* splunk-forwarder-formula
- (linux) Uses a symlink to ensure logs are in the /var/log partition
* dotnet4-formula
- Adds support for .NET 4.7.2
* nessus-agent-formula
- New salt formula distributed with Watchmaker