Updates RSpec
Adds fuubar as the rspec formatter.
Modifies Command Passing
Changes the structure of arguments such that the arguments passed
never are in direct contact with the shell when using the Spawn
and PosixSpawn backends.  This should help prevent
vulnerabilities.  Closes #2.
Changes Interpolation Method
This allows any unsafe interpolations to define arguments
seperately from how the arguments were previously set up,
allowing developers to pass in their own arguments via
the unsafe interpolations.