provides TravisCI configuration files 

See https://travis-ci.org/westonplatter/YCSB/builds/20867367 for test run of the Travis CI setup.

In order for the Travis CI builds to be executed, @brianfrankcooper will need to turn on integration with travis for the repo. @brianfrankcooper - is this cool with you?

Right now the configuration just tests the system the OracleJDK7 and OpenJDK7. Is it worth testing additional versions?