[yt-svn] [yt_analysis/yt] Update install script hosts information (issue #400)

[Matthew Turk]

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New issue 400: Update install script hosts information
https://bitbucket.org/yt_analysis/yt/issue/400/update-install-script-hosts-information

Matthew Turk:

This should include:

 * Removing old XSEDE hosts
 * Adding Gordon, Trestles and any other machines
 * Making a note about Ubuntu required packages

Responsible: MatthewTurk
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