Fix yRangePad for logscale graphs, add tests.
authorKlaus Weidner <klausw@google.com>
Tue, 1 Mar 2016 21:57:05 +0000 (13:57 -0800)
committerKlaus Weidner <klausw@google.com>
Tue, 1 Mar 2016 22:00:37 +0000 (14:00 -0800)
Also includes a minor refactor to consolidate duplicated code for
toDataCoord calculations on logscale axes.

Fixes issue #661.


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