Update readme
Add link to my page about this exerience
Add instructions for building and running
Remove other implementations
Add readme about my fork
Eliminate unneeded Box
Fix bug in perf dividing by wrong number
Eliminate some unneeded unwrapping
Eliminate unneeded Rc
Wrap data type in an Rc
Abstract type interactions
Refactor core library some more
Only include tests relevant to step
Refactor core library
Print header upon staring repl
Don't error on a blank file
Define not using mal itself

This fixes a bug I had in my own not function which caused `(not nil)`
to return `false`. Oops.
Fix bug handling blank line error from file
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