Export recorded runs

[craig-willis]

Fixes https://github.com/whole-tale/whole-tale/issues/90

This PR:

• Updates manifest.py to include recorded run information and files if one or more runs are present for a version
• Updates exported tales to include updated manifest.json and run files in payload

To test:

• Create a new tale with two entrypoint scripts that create output files
• Execute a recorded run for each entrypoint
• Export tale/version associated with the run
• Confirm that the manifest.json includes information for both runs
• Confirm that payload includes files from both runs

[codecov[bot]]

Codecov Report

Merging #516 (2e2ae35) into master (2275f71) will increase coverage by 0.08%. The diff coverage is 100.00%.

:exclamation: Current head 2e2ae35 differs from pull request most recent head 76e42d9. Consider uploading reports for the commit 76e42d9 to get more accurate results

@@            Coverage Diff             @@
##           master     #516      +/-   ##
==========================================
+ Coverage   93.33%   93.41%   +0.08%     
==========================================
  Files          54       54              
  Lines        4125     4179      +54     
==========================================
+ Hits         3850     3904      +54     
  Misses        275      275              

Impacted Files	Coverage Δ
server/lib/exporters/__init__.py	98.18% <100.00%> (+0.14%)	:arrow_up:
server/lib/exporters/bag.py	100.00% <100.00%> (ø)
server/lib/exporters/native.py	100.00% <100.00%> (ø)
server/lib/manifest.py	92.07% <100.00%> (+0.64%)	:arrow_up:
server/models/tale.py	98.09% <100.00%> (+0.01%)	:arrow_up:
server/rest/tale.py	96.47% <100.00%> (+0.33%)	:arrow_up:

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