Add integration with Girder WT plugin

[Xarthisius]

Enables two way integration between Girder and WT Home directory. Requires current master (https://github.com/whole-tale/girder/commit/91e295d9eefec2e152f23036578c8b402c60dfe3), adding tests and a bit of refactoring. Otherwise, it's a working proof-of-concept. @hategan PTAL

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@5c9e573). Click here to learn what that means. The diff coverage is 80.2%.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   71.35%           
=========================================
  Files             ?        8           
  Lines             ?      370           
  Branches          ?        0           
=========================================
  Hits              ?      264           
  Misses            ?      106           
  Partials          ?        0

Impacted Files	Coverage Δ
server/constants.py	100% <ø> (ø)
server/models/password.py	36.2% <ø> (ø)
server/lib/DirectoryInitializer.py	94.11% <ø> (ø)
server/lib/Authorizer.py	64.86% <ø> (ø)
server/resources/homedirpass.py	61.11% <ø> (ø)
server/lib/WTDomainController.py	69.35% <50%> (ø)
server/lib/WTFilesystemProvider.py	77.86% <74.62%> (ø)
server/__init__.py	96.29% <96.29%> (ø)

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[hategan]

Looks good to me