Accept `&str` instead of `String` in `rustbox::print`.
Remove unneeded `return`s.
Make use of the ability to assign values to enum variants.
Don't put safe code inside `unsafe` blocks.
Fix example.
Merge pull request #6 from utkarshkukreti/misc-refactor

Misc refactor
Added missing lifetime param
Merge remote-tracking branch 'theirs/master' into fix_rustbox
Manually reapplying changes--this is really a merge commit.