Implement REST API

[dixonwhitmire]

Implement the REST API layer for LinuxForEDI which is used to wrap the xWorkflows transitions.

Endpoints include:

• /analyze [POST] - runs analyze
• /enrich [POST] - runs analyze, enrich
• /validate [POST] - runs analyze, validate
• /translate [POST] - runs analyze, translate
• /process [POST] - runs all workflow steps

Support the following post parameters:

• async: boolean - True/False: indicates if processing is async, requiring a callback URL when results are complete
• edi: string - the edi message