Updated for Ruby 2.3, added Travis CI build#8

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szTheory wants to merge 3 commits intoactfong:masterfrom

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Commits on Apr 10, 2018

update for Ruby 2.2, add Travis CI
szTheory
committed
update Travis CI to remove 1.9.3 and 2.4.0 support. 2.4.0 doesn't work at the moment due to an incompatibility with the current version of fakeweb.
szTheory
committed
update Travis CI build badge in README for rdoc format
szTheory
committed