ARROW-1580: [Python] Instructions for setting up nightly builds on Linux
ARROW-1580: [Python] Instructions for setting up nightly builds on Linux

Author: Phillip Cloud <cpcloud@gmail.com>

Closes #1489 from cpcloud/ARROW-1580 and squashes the following commits:

ff815678 [Phillip Cloud] Move to sphinx
700d2c5e [Phillip Cloud] Remove link to nightlies
9fbe9ac9 [Phillip Cloud] Add build artifact location
cb9f2a5a [Phillip Cloud] [Python] Instructions for setting up nightly builds on Linux

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