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I added some more node versions to test for and cleaned the travis script. The current version of node is v4.0.0 and roslib doesn't work on that due to an issue in Automattic/node-canvas#622. We could fix this with #194.
Version 1 and 2 are versions of io.js but apparently roslib works fine on there. Version 3 was the 'alpha' of node v4.