### NONE OF THE BELOW WORKS ###
What I tried to make it work so far is
installing rails installer ruby 2.2, not the 2.3 (i'm not sure why)
From the command line:
- run 'gem install bcrypt' (this will install 3.1.11 x86-mingw32 from rubygems.org)
- RELOAD the WEB SERVER
# from console, do this
# gem uninstall bcrypt
# gem uninstall bcrypt-ruby
# gem install bcrypt --platform=ruby
# then put this into the gem file
# gem 'bcrypt', '~> 3.1.7', :platforms => :ruby