user/files -> files; Not sure about csv

[mccalluc]

fix #2001

[codecov-io]

Codecov Report

Merging #2007 into develop will not change coverage.
The diff coverage is 42.85%.

@@           Coverage Diff            @@
##           develop    #2007   +/-   ##
========================================
  Coverage    44.12%   44.12%           
========================================
  Files          415      415           
  Lines        27575    27575           
  Branches      1322     1322           
========================================
  Hits         12168    12168           
  Misses       15407    15407

Impacted Files	Coverage Δ
.../source/js/user-file-browser/services/user-file.js	65% <ø> (ø)	⬆️
...le-browser/ctrls/user-file-browser-filters-ctrl.js	12.5% <0%> (ø)	⬆️
...file-browser/ctrls/user-file-browser-files-ctrl.js	11.76% <0%> (ø)	⬆️
refinery/user_files_manager/tests.py	100% <100%> (ø)	⬆️
refinery/user_files_manager/urls.py	100% <100%> (ø)	⬆️

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[mccalluc]

@scottx611x : Could you review this?
@ngehlenborg : Is /files_download ok for the CSV? Or suggest something you prefer: I don't think the whole team needs to be looped into this discussion.

[ngehlenborg]

What about .../files?download=csv? Could easily be extended to .../files?download=xls etc.

Note our naming convention for API endpoints: https://github.com/refinery-platform/refinery-platform/wiki/coding-style-guide#rest-api

[mccalluc]

Sure: since that's more than a routing change, I don't want to let that block this bit, but I've filed #2013.