Make kiva_explorer a popup

[aaronayres35]

fixes #509

This is very short PR which simply changes kiva_explorer to come up as a popup rather than trying to compress it into the demo tab of the etsdemo application. All this requires is a change to use the magic named popup

[jwiggins]

You should add a comment explaining the magic naming. Otherwise LGTM

[codecov-io]

Codecov Report

Merging #510 (8a5cdc7) into master (2ae4f5c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #510   +/-   ##
=======================================
  Coverage   30.71%   30.71%           
=======================================
  Files         210      210           
  Lines       17840    17840           
  Branches     2454     2454           
=======================================
  Hits         5479     5479           
  Misses      12028    12028           
  Partials      333      333           

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[jwiggins]

Thanks for the update.