20190105 offline playback

[nbastin]

Fixes issue #11 and adds a test to prevent regression. Also cleans up test_episodes.py so that they don't permanently modify the DataFile.DEFAULT_DOWNLOADED_DIR and thus prevent testing this issue.

[codecov]

Codecov Report

Merging #15 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   97.05%   97.11%   +0.06%     
==========================================
  Files          28       28              
  Lines        2378     2394      +16     
==========================================
+ Hits         2308     2325      +17     
+ Misses         70       69       -1

Impacted Files	Coverage Δ
tests/test_perspective_primary.py	100% <100%> (ø)	⬆️
castero/perspectives/primary.py	99.43% <100%> (ø)	⬆️
tests/test_episode.py	100% <100%> (ø)	⬆️
castero/episode.py	99.04% <0%> (+0.95%)	⬆️

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[xgi]

Looks good to me, thanks for the help!