Add 800-53A and update DoD CCI mappings

[jason-callaway]

There are numerous CCIs that map to 800-53A controls. For example:

<reference creator="NIST" title="NIST SP 800-53A" version="1" location="http://csrc.nist.gov/publications/PubsSPs.html" index="AC-1.2 (i)" />

Add 800-53A to the graph and update DoD CCI mappings, noting that some use logical and descriptions like:

<reference creator="NIST" title="NIST SP 800-53A" version="1" location="http://csrc.nist.gov/publications/PubsSPs.html" index="AC-1.1 (i and ii)" />

[trevorbryant]

Here is another repo worth looking at.

https://commoncriteria.github.io/pp/references/nistvscci.html