How to prevent installing documentation for gems automatically using gem v. 2.0

How to prevent installing documentation for gems automatically using gem
v. 2.0

References

Reference NO 1

http://stackoverflow.com/questions/15190859/how-to-prevent-installing-documentation-for-gems-automatically-using-gem-v-2-0

Reference NO 2

http://stackoverflow.com/questions/14272166/gem-install-v-installs-wrong-version-of-a-gem

Reference NO 3

http://blog.rubygems.org/2013/02/24/2.0.0-released.html

Reference NO 4

http://guides.rubygems.org/command-reference/

Reference NO 5

http://rubygems.rubyforge.org/rubygems-update/History_txt.html

Reference NO 6

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Reference NO 7

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Reference NO 8

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