Include repo2docker_version on import

[craig-willis]

Problem:

Importing a tale doesn't include the repo2docker_version used.

Approach:

Add support for imageInfo["repo2docker_version"] if present during import.

Test:

• Import https://girder.local.wholetale.org/api/v1/integration/zenodo?doi=10.5072%2Fzenodo.1059441&resource_server=sandbox.zenodo.org
• Confirm:

  "imageInfo": {
  "repo2docker_version": "wholetale/repo2docker_wholetale:v1.1.post0"
  },

• Build the image, if you dare, and see if run.sh still works...

[codecov[bot]]

Codecov Report

Merging #549 (7f84ade) into master (04e52fc) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #549      +/-   ##
==========================================
+ Coverage   92.80%   92.81%   +0.01%     
==========================================
  Files          60       60              
  Lines        4738     4745       +7     
==========================================
+ Hits         4397     4404       +7     
  Misses        341      341              

Impacted Files	Coverage Δ
server/models/tale.py	98.09% <ø> (ø)
server/lib/manifest_parser.py	87.74% <100.00%> (+0.57%)	:arrow_up:

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