Vagrant not autoswitching between ruby versions

[diingo]

I saw this with Moe and Sarmad. I'm other students too but remember them in particular.

[truffaut]

I'll need more info on this one. It seems to be working correctly for me at the moment. Some useful information to write down if this bug is encountered again:

1. What the return value of ruby -v is in the console
2. Whether or not a .ruby_version file exists and what the contents of the file are if it does
3. What ruby version is specified in the Gemfile
4. What ruby versions are installed (checked through rbenv versions)