v0.1.1 - Macro improvments

Macro improvements

• Document how to use serde_bytes::ByteBuf with node Buffers
• Allow docs and other attributes on functions in export macro
• add #[allow(snake_case)] added by default in export macro
• Better behaviour for Option<T> in export macro

...
export! {
    /// Adding docs and attributes here now works
    fn get_length(name: Option<String>) -> Option<u8> {
        name.map(|n| n.len())
    }
}

nativeModule.get_length()          // Works as of v0.1.1
nativeModule.get_length("1")       // Always worked
nativeModule.get_length(null)      // Always worked
nativeModule.get_length(undefined) // Always worked