Merge branch 'master' of github.com:eigenhombre/smallscheme

Add alpha status caveat.

Add Python import and run file to Docker PIP tests. For #15.

Add new math functions and add arities to equals/inequalities. For #13

- Add docs to README including caveat
- / now does floating division
- n-ary =, <, >
- sin, cos, atan functions
- displayln function
- move more python tests into scheme

Add `let` to README. #12

Implement #9, rlwrap functionality.

A few more tests for completeness

More refactoring, prep for #4

More tests to unbreak PyPI releases

More tests to unbreak PyPI releases