extract selenium install logic to a module#54

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Sergeon wants to merge 2 commits intodwyl:masterfrom Sergeon:separate-install-selenium

Commits on Feb 3, 2017

extract selenium install logic to a module
Mauro Caffaratto
committed

Commits on Feb 4, 2017

Cleaned outdated reference to nightwatch.conf.js as a postinstall hook and deleted redundant postinstall explanation.
Mauro Caffaratto
committed