Add CI

[palfrey]

Mostly to fix/test the out-of-the-box scenario (i.e. #39). This PR:

• Adds Travis CI (and a build badge that will need pointing to here, not my fork, once that gets enabled).
• Fixes the "ne" case in mappings
• And FHIRUnitTestItem's use of enum name
• Adds an exception for null values for plandefinition-example-cardiology-os as that file has that broken data, and I'm guessing that's just fine, right? Updated default download spec to R4 so we have working tests.

See https://travis-ci.org/github/palfrey/fhir-parser/builds/714539338 for working demo build

[palfrey]

@raheelsayeed @p2-apple @jmandel Any thoughts on this one?

[p2-apple]

Instead of hardcoding a workaround for the broken test data, have you tried pointing Default/settings.py to DSTU2 or R4 instead of the May2018 beta build? I'd prefer it if we didn't have to hardcode test data exceptions in the code.

[palfrey]

Instead of hardcoding a workaround for the broken test data, have you tried pointing Default/settings.py to DSTU2 or R4 instead of the May2018 beta build? I'd prefer it if we didn't have to hardcode test data exceptions in the code.

I hadn't, no. I've now set it to default to R4 and it works without the hack.

[p2-apple]

Sweet! Mind deleting the May2018 line entirely? Might confuse others that it may have special meaning but it's just the last that was used.

[palfrey]

Sweet! Mind deleting the May2018 line entirely? Might confuse others that it may have special meaning but it's just the last that was used.

Done