chruby upgraded to 0.3.6, was 0.3.5.

https://github.com/postmodern/chruby/blob/master/ChangeLog.md#036--2013-06-23

0.3.6 / 2013-06-23
==================

chruby_use no longer echos the selected Ruby.

chruby-exec
-----------

Now runs under bash. Load chruby.sh for CHRUBY_VERSION.

auto.sh
-------

Record and compare the contents of .ruby-version files in order to detect
modifications, such as when switching between branches.