REST interface

[goodmami]

Possibly include a REST interface (e.g. delphin.interfaces.rest) for parser output (including derivations, MRS, etc.).

See here: http://moin.delph-in.net/ErgApi

Also see this discussion: http://lists.delph-in.net/archives/developers/2016/002271.html

If a server (e.g. Bottle) is required, then maybe this should be a separate module from pyDelphin. If it does belong, however, then the results from delphin.interfaces.ace should probably use this API (at least the Python side of it).

The EDS output would depend on #25.

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Edit: pyDelphin can provide a REST client, which formats the request, sends it to a server, receives the response, and interprets the values of the response, but it's probably out-of-scope to provide a REST server as well. The client thus requires codecs for some other formats (e.g. the JSON formats; see #68), but it's not expected to interpret all (e.g. the LaTeX formats).