Update url-loader from 0.5.8 to 0.6.2 in app/angular

[Hypnosphi]

Issue: #2842

@shilman this is a security upgrade, so we probably need another patch release

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This change is 

[codecov]

Codecov Report

Merging #2847 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2847   +/-   ##
=======================================
  Coverage   35.82%   35.82%           
=======================================
  Files         428      428           
  Lines        9423     9423           
  Branches      967      981   +14     
=======================================
  Hits         3376     3376           
+ Misses       5405     5390   -15     
- Partials      642      657   +15

Impacted Files	Coverage Δ
app/polymer/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/polymer/src/server/babel_config.js	0% <0%> (-76.67%)	⬇️
addons/actions/src/lib/util/getPropertiesList.js	60% <0%> (ø)	⬆️
...ddons/actions/src/components/ActionLogger/index.js	74.35% <0%> (ø)	⬆️
addons/storyshots/src/vue/renderTree.js	60% <0%> (ø)	⬆️
addons/a11y/src/components/WrapStory.js	61.11% <0%> (ø)	⬆️
addons/knobs/src/components/types/Date/index.js	23.52% <0%> (ø)	⬆️
lib/core/src/client/manager/index.js	0% <0%> (ø)	⬆️
addons/info/src/components/types/OneOfType.js	57.14% <0%> (ø)	⬆️
...tories_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
... and 60 more

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