BROWSER=none don't open browser after publish

[quangv]

#170

looks at environment variable BROWSER if none don't open browser after publishing.

similar to how creact-react-app supress browesr opening for start. facebook/create-react-app#873

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #171 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #171   +/-   ##
=======================================
  Coverage   80.85%   80.85%           
=======================================
  Files          85       85           
  Lines        5700     5700           
  Branches      914      914           
=======================================
  Hits         4609     4609           
  Misses        932      932           
  Partials      159      159

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