Possible docx template example [Do not merge]

[geramirez]

Currently the template engine only supports one way of getting control data.
For example the tag below produces

{{ getControl "NIST-800-53@CM-2"}}

this:

Amazon Elastic Compute Cloud  
Justification in narrative form  
Covered By:  
- EC2 Verification 1 http://VerificationURL.com  

We could implement more complex functions in templates using code similar to the code in this branch to customize the way data is rendered.
For example:

{{ with getJustifications “NIST-800-53@CM-2” }}
{{ range $justification := . }}
{{$justification}}
{{$justification.SatisfiesData.Narrative}}
{{len $justification.SatisfiesData.CoveredBy }}
{{range $coveredBy := $justification.SatisfiesData.CoveredBy}}
{{$coveredBy}}
{{end}}
{{end}}
{{end}}

[afeld]

@jcscottiii Should we keep this PR open, or has it been subsumed by other changes?