Run TravisCI against Ruby 1.9.2

There appears to be an issue with ruby-debug on 1.9.3. Using 1.9.2 for now.
avdi · Jan 9, 2012 · e6035b6 · e6035b6
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commit e6035b6
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diff --git a/.travis.yml b/.travis.yml
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+rvm: 1.9.2