Plugins support + cordova plugin

[glena]

• Check prod build process (it is using auth0 for both builds)

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@bbc6e50).

@@            Coverage Diff            @@
##             master     #333   +/-   ##
=========================================
  Coverage          ?   98.43%           
=========================================
  Files             ?       34           
  Lines             ?     1151           
  Branches          ?      190           
=========================================
  Hits              ?     1133           
  Misses            ?       18           
  Partials          ?        0

Impacted Files	Coverage Δ
plugins/cordova/plugin-handler.js	100% <100%> (ø)
src/helper/qs.js	100% <100%> (ø)
src/web-auth/popup.js	100% <100%> (ø)
plugins/cordova/index.js	100% <100%> (ø)
src/helper/assert.js	100% <100%> (ø)
src/web-auth/index.js	97.79% <100%> (ø)
src/helper/popup-handler.js	100% <100%> (ø)
src/helper/plugins.js	100% <100%> (ø)
plugins/cordova/popup-handler.js	91.54% <91.54%> (ø)

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