Yaml File handler

A Yaml File Handler written in Rust. Based on Yaml implementation of [Chyh1990] (https://github.com/chyh1990/yaml-rust)

 How to use it

Simple example:

```rust fn main() { let mut handler = YamlHandler::new();

handler.add_files(vec![ "app/ressources/config/parameters.yml" ]);

let data = match handler.readallfiles() { Some(data) => data, println!("none here test!!"); None => { return; } };

println!("{}", data["parameters.yml"]["server"]["hostname"].as_str().unwrap()); } ```