Handle some of the reported by clippy

[laumann]

• Markdown format doc title
• Change loop {} to while let .. {}
• Remove unused #[macro_use]
• Change owned args to borrowed in some places

Fixes #37

[laumann]

clippy complained about complicated types and suggests type aliases, but long types are kind of inevitable with this library, so I haven't changed those.

[laumann]

I also ignored the many_single_char_names lint. In the planeclip example there are quite a few single-letter variables (up to eight?), but it's okay I think.

[Munksgaard]

I also ignored the many_single_char_names lint. In the planeclip example there are quite a few single-letter variables (up to eight?), but it's okay I think.

Is it possible to add some annotations or options in the Cargo.toml to silence those warnings?

Good work by the way!

[laumann]

Is it possible to add some annotations or options in the Cargo.toml to silence those warnings?

I added cfg_attr in the right places to ignore some lints. But it'd be nice if clippy.toml could be used to list allow/warn/deny levels for specific lints.

[Munksgaard]

Looks good :+1:

[laumann]

I can merge?

[Munksgaard]

Yeah, go ahead :)