TensorBoard 0.4.0-rc3

TensorBoard 0.4.0-rc2

TensorBoard 0.4.0-rc1 (tensorflow#629)

TensorBoard 0.1.8

TensorBoard 0.1.7

TensorBoard 0.1.6

TensorBoard 0.1.5

Set version to 0.1.4

This is because twine failed midway when uploading 0.1.3, which caused it to be
de-listed and unable to be uploaded again to PyPi.

Fix downloaded graph PNGs to make them not tiny (tensorflow#371)

Summary:
In the graph dashboard, we attempt to set the size of the download
canvas according to the scene size. However, the syntax that we use to
do this is no longer supported by d3v4 ([source]), and so this ends up
doing nothing. Simply changing the syntax fixes the bug.

Fixes tensorflow#88.

[source]: d3/d3#2793

Test Plan:
Launch the graph explorer, and click "Download PNG" at left. Before this
patch, this always resulted in a 300×150 px image. Now, it results in an
image whose size is properly determined by the contents of the graph.

wchargin-branch: fix-graph-png-size