Allow users to add native web thing by URL from UI.

[mrstegeman]

Fixes #69

[codecov-io]

Codecov Report

Merging #815 into master will decrease coverage by 0.63%.
The diff coverage is 41.93%.

@@            Coverage Diff             @@
##           master     #815      +/-   ##
==========================================
- Coverage   77.74%   77.11%   -0.64%     
==========================================
  Files          87       87              
  Lines        3721     3762      +41     
  Branches      497      501       +4     
==========================================
+ Hits         2893     2901       +8     
- Misses        760      789      +29     
- Partials       68       72       +4

Impacted Files	Coverage Δ
src/controllers/addons_controller.js	49.09% <0%> (ø)	⬆️
src/models/thing.js	93.44% <100%> (ø)	⬆️
src/models/things.js	94.64% <100%> (ø)	⬆️
src/controllers/new_things_controller.js	43.75% <26.31%> (-31.25%)	⬇️
src/controllers/things_controller.js	82.8% <37.93%> (-10.49%)	⬇️
src/addon-manager.js	62.06% <57.14%> (-0.06%)	⬇️

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[hobinjk]

What happens if the list of urls already contains the web thing's url? (user presses enter twice or just forgets)

[mrstegeman]

It will be handled by the adapter just fine, since the adapter keeps track of "known URLs" when loading things.

[hobinjk]

LGTM