Simple proxy detection support

[dgolovin]

[codecov-io]

Codecov Report

Merging #1404 into master will decrease coverage by 0.7%. The diff coverage is 82.22%.

@@            Coverage Diff             @@
##           master    #1404      +/-   ##
==========================================
- Coverage   92.57%   91.87%   -0.71%     
==========================================
  Files          47       47              
  Lines        4929     5021      +92     
  Branches      551      871     +320     
==========================================
+ Hits         4563     4613      +50     
- Misses        366      373       +7     
- Partials        0       35      +35

Impacted Files	Coverage Δ
browser/services/request.js	84.37% <82.22%> (-13.41%)	:arrow_down:
browser/model/devstudio-autoinstall.js	97.29% <0%> (-2.71%)	:arrow_down:
browser/services/platform.js	97.39% <0%> (-2.23%)	:arrow_down:
browser/pages/install/controller.js	91.86% <0%> (-1.75%)	:arrow_down:
browser/model/helpers/downloader.js	95.53% <0%> (-1.68%)	:arrow_down:
browser/model/che.js	95% <0%> (-1.62%)	:arrow_down:
browser/model/jdk-install.js	93.78% <0%> (-1.51%)	:arrow_down:
browser/pages/account/controller.js	98.61% <0%> (-1.39%)	:arrow_down:
browser/model/cdk.js	97% <0%> (-1.15%)	:arrow_down:
browser/model/devstudio-p2-zip.js	64.4% <0%> (-1.12%)	:arrow_down:
... and 25 more

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[dgolovin]

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