Auto merge of #229 - mbrubeck:src, r=jdm

Move source files into src directory

This moves the `tests` module into a separate file, and moves all source files into a `src` directory, to conform with the default layout for Rust projects.

Author: bors-servo

Cargo.toml

@@ -18,10 +18,6 @@ union = []
 specialization = []
 may_dangle = []
 
-[lib]
-name = "smallvec"
-path = "lib.rs"
-
 [dependencies]
 serde = { version = "1", optional = true, default-features = false }