Use Anaconda for autoscaling example and add example config for devel…

[robertnishihara]

This fixes #1358 and also provides an example of how to use the autoscaler for development.

Note some inconveniences:

• We seem to always have to prefix commands with the appropriate PATH.
• We have to change directories in the same line because changing directories doesn't persist across commands.

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[pcmoritz]

Note that the path problem should be fixed by this: https://github.com/ray-project/ray/pull/1348/files#diff-2691ece495b9e3385c14189d8a32b54eR158 and defining the path in the .profile (ideally .bashrc, not sure if we have figured out how that works)

see --rcfile: https://www.gnu.org/software/bash/manual/html_node/Bash-Startup-Files.html#Bash-Startup-Files

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Merged build finished. Test PASSed.

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[pcmoritz]

I'm excited about the development yaml file, that can save a lot of time :)

[ericl]

I figured out a workaround to emulate interactive mode (set -i && source ~/.bashrc), that should allow the commands to run exactly as in an interactive prompt.

[ericl]

This LGTM.