Parse the binary multiplication operator
Add a simple REPL (e.g.: irb)
Implement a (very small) VM for an interpeter

Mostly just a map with some convenience methods right now.
REPL prints out the value returned for each statement

Doesn't handle cases where statements *MIGHT* need to go on for several lines
e.g.: class or function definitions, but this is a good step forward towards
building something like irb.

Considering calling it grubbirb internally, although that may be too silly.