Joined February 2012
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Achievements
71 Karma
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Ashcat
Make Ruby on Rails better for everyone by getting a commit accepted
Opabinia
Started social coding on GitHub within 6 months of its first signs of life
Altruist
Increase developer well-being by sharing at least 20 open source projects
Forked
Have a project valued enough to be forked by someone else
Charity
Fork and commit to someone's open source project in need
Mongoose 3
Have at least three original repos where Ruby is the dominant language
Mongoose
Have at least one original repo where Ruby is the dominant language
@calebwright is correct. And with distributed teams and non-standard development environments, it's not a great idea to fully commit one way or the other (fully ignoring .rvmrc files or assuming a .ruby-gemset, for example).
I put together a quick Gist at https://gist.github.com/nbibler/5307941 which describes a .powrc file you can put in your application directory that accounts for having a .rvmrc, .ruby-version, and optionally a .ruby-gemset files.