removed jruby from the travis continuous integration as jruby does not build native extensions very well, like sqlite which is used in the test suite.
removed jruby from the travis continuous integration as jruby does
not build native extensions very well, like sqlite which is used
in the test suite.

msquitieri/shortener,BublTechnology/shortener,jpmcgrath/shortener,x44x45x41x4E/shortener,ajose01/shortener,jpmcgrath/shortener,robzdc/shortener,otzy007/shortener,honwlee/shortener,BublTechnology/shortener,honwlee/shortener,SparkHub/shortener,ajose01/shortener,SparkHub/shortener,x44x45x41x4E/shortener