adds all properties to context with implicit dandi schema

[satra]

supercedes #73

@surchs - this PR incorporates the changes in #77 and then extends it to address the namespace issue. i did not include explicit namespace in this PR.

• adds all properties to context
• adds test to ensure there is no conflict

[codecov]

Codecov Report

Merging #84 (d07f57d) into master (e91ccfb) will increase coverage by 0.03%.
The diff coverage is 93.54%.

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
+ Coverage   89.44%   89.47%   +0.03%     
==========================================
  Files          14       14              
  Lines        1355     1378      +23     
==========================================
+ Hits         1212     1233      +21     
- Misses        143      145       +2     

Flag	Coverage Δ
unittests	89.47% <93.54%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
dandischema/tests/test_models.py	95.23% <90.90%> (-0.66%)	⬇️
dandischema/metadata.py	96.90% <100.00%> (+0.01%)	⬆️

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[surchs]

Thanks @satra for the ping and really sorry I didn't manage to help with this in in time - I got swamped. I had a look and I think this will be very helpful to continue playing with the jsonld of the dandisets in the future. I'll give it a try.

[satra]

@surchs - thanks. i'm going to merge this in and we can evolve the schema in the future.

@yarikoptic - i can label this for release, unless we want to get any other things in. and perhaps test out the schema with vjsf before release to make sure that bit works. that's something we don't have any automation on.