style: use 4 space indent and make things a bit easier to read
Bump year
style: follow new style guide for indentation

https://gist.github.com/evancz/0a1f3717c92fe71702be
style: move multi-line strings down to use 4-space indents
Use a more typical definition of xor
Get rid of trailing zeros in version number
style: update for new style guide

https://gist.github.com/evancz/0a1f3717c92fe71702be
style: conform to new style guide
style: conform to new style guide
style: conform to new style guide
style: conform to new style guide
style: conform to new style guide
style: conform to new style guide
Rename some function names to make meaning a bit clearer
update tests for changes elsewhere / style update
Rename Env.Repl to Env.Env
Rename Env.toElm to Env.toElmCode