Add Data Dictionary Testing to Commander

[darnjo]

This issue is for adding Data Dictionary testing to the RESO Commander.

See the Data Dictionary Test specification for more information.

In general, this means validation of the following:

• Metadata (either remotely or locally)
• String Fields
• Integer Fields
• Date Fields (ISO-8601 'yyyy-mm-dd' format)
• Decimal Fields
• Boolean Fields
• Single Enumerations (Edm.EnumType with IsFlags="false")
• Multiple Enumerations (either Edm.EnumType with IsFlags="true" or Collection(Edm.EnumType))
• Timestamp Fields (ISO-8601 format)

Additionally:

• Reporting
• Warnings for SHOULD items like length and precision
• Lookups tests
• Synonym Checking
• Similar Name Matching
• Added strict mode so that passing --Dstrict=true to automated tests will cause tests to fail on invalid metadata
• Update acceptance tests
• Update automated gradle build on GitHub
• Create all-in-one test/reporting task for DD testing
• Update README
• ----- MVP RELEASE -----

Outstanding Issues:

• Determine whether Skipped Scenarios can not be counted as Failed in the reports.