Auto merge of #1431 - IvanUkhov:newlines, r=alexcrichton

Auto merge of #1431 - IvanUkhov:newlines, r=alexcrichton

Hi,

It seems that people generally prefer not having newlines after section headers in their `Cargo.toml`s. However, when one creates a new package via `cargo new`, a newline gets automatically inserted after `[package]`. Then a typical `Cargo.toml` ends up being some what inconsistent: there is a newline after `[package]`, and there are no newlines after other headers.

On top of that, the examples given on crates.io do not seem to be consistent: [sometimes](http://doc.crates.io/index.html) there is a newline after `[package]`, and [sometimes](http://doc.crates.io/manifest.html) there is none. The same applies to other section names.

I am wondering if there should be some style conventions in this regard.

Regards,
Ivan