Initial version of tests

Hi, 
I prepared some tests infrastructure. It's based on Jasmine and integrated with Travis-CI. First test case verifies, that variety can analyze collection 'users' provided in readme and results match.

Tests can be run locally (requires node.js, see readme in tests directory for instructions). 

Example of Travis-CI result can be seen on https://travis-ci.org/todvora/variety/builds/26490549 . Integration run out of the box with Travis. No other repository configuration required.