Update tests to use elasticsearch 2.4.4 and 1.7.6
Update tests to use elasticsearch 2.4.4 and 1.7.6

Closes #288.

kneubi/fscrawler,dadoonet/fsriver,kneubi/fscrawler,kneubi/fscrawler,dadoonet/fsriver,dadoonet/fscrawler,dadoonet/fscrawler,dadoonet/fsriver,dadoonet/fscrawler