Auto merge of #40 - mbrubeck:docs, r=Ms2ger

Docs, code cleanup, and misc. fixes for smallvec

<!-- Reviewable:start -->
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/rust-smallvec/40)
<!-- Reviewable:end -->

Author: bors-servo

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "smallvec"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Simon Sapin <[email protected]>"]
 license = "MPL-2.0"
 repository = "https://github.com/servo/rust-smallvec"
@@ -12,4 +12,3 @@ documentation = "http://doc.servo.org/smallvec/"
 [lib]
 name = "smallvec"
 path = "lib.rs"
-doctest = false