palantir/plottable — pull request #1259 by danmane (2014-10-27 23:41:53+00:00)
Title: Ensure TimeAxis w/o orientation fails cleanly

Fix minor bug where if TimeAxis is instantiated w/o an orientation, it fails
in a hard-to-decipher way because the orientation.toLowerCase() breaks on
input before the AbstractAxis class has a chance to throw a proper error.