Tag new release with small API addition

Also, update bindgen version and format some of the comments and
documentation.

cargo test passes

docs/Development_Setup.md

@@ -14,6 +14,7 @@ $ xcode-select --install
 $ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 $ brew install rust
 $ brew install imagemagick@6
+$ brew link --force imagemagick@6
 $ brew install pkg-config
 ```