Add random runner
Add leading `do` to :init

This shouldn't be necessary; this is just a quickfix.
Bump to 0.5.0
Bump to SNAPSHOT for next iteration
Complete first koan
Finish exercise 2
Complete exercise 3
Complete exercise 4
Complete exercise 5
Complete Exercise 6
Complete Exercise 7
Complete Exercise 8
Complete Exercise 9
Complete Exercise 10
Complete Exercise 11
Complete Exercise 12