Site updates 0.83

Created 2/27/2013, updated 5/18/2017

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623ad87 Bump Ruby to 1.9.3-p392
a523368 Goodbye RVM
d5af8de Switch to rbenv
421a5d6 Update to Ruby 2.0.0-p0, updating bundle in the process
8fa9b17 script/deploy: require Bundler 1.3.0 release
f99fa3c Bump a copyright year
ffa5fe8 Update wikitext gem (4.0 -> 4.0.1)