substitute spaces for tabs in repl input - fixes #20
Docs update - Indentation Error

fixes #23
Workaround: Linux ST2 doesn't package resource module.

Fixes #21
Update README.md

Link to Racket pull request as documentation for contributed REPLS.
Add support for Racket (Scheme)
Update README with Scheme support
prevent empty lines from causing a timeout
add racket prefix
Sort alphabetically, correct prompt