Rename README and fix main's shebang.
Localize functions.
Mv sources to src dir.
Merge branch 'feature/refactor-droll-api' into develop
Add first part of lpeg parser. With tests.
Implement parser function.
Add basic evaluation for the AST.
Add rollwise ops.
Sort rolls.
Make main use eval.
Don't sort rolls.
Add parser support for function calls.
Implement func evaluation and add sum().
Implement max() and min().
Implement maxn() and min().
Implement p().
Add error handling for nonexistant calls.
Implement run().
Improve nonexistant call handling.
Rewrite main to use run().