Add latest stable version of JRuby to Travis CI build matrix #288
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Since @headius fixed jruby/jruby#4250 and it was released in JRuby v9.1.6.0, the Mocha unit & acceptance tests have all been passing under this latest version of JRuby.
However, an assertion related to the stack-trace from a Mocha exception was failing under JRuby for both Minitest & Test::Unit (see this comment for details). This PR filters out JRuby-related lines of the stack-trace thus fixing the assertions.
Finally this PR also adds JRuby to the Travis CI build matrix in the hope that we can prevent regressions in the future.