playfair_cipher 0.2.0

Playfair cipher as described at <https://en.wikipedia.org/wiki/Playfair_cipher>.
Documentation 
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# playfair_cipher
Implementation of the [PlayFair cipher](https://en.wikipedia.org/wiki/Playfair_cipher) - nothing special, nothing useful, just for fun. 


## Encrypt

```rust
use playfair_cipher::{PlayFairKey, CharNotInKeyError};

let pfc = PlayFairKey::new("playfair example");
match pfc.encrypt("hide the gold in the tree stump") {
  Ok(crypt) => {
    assert_eq!(crypt, "BMODZBXDNABEKUDMUIXMMOUVIF");
  }
  Err(e) => panic!("CharNotInKeyError {}", e),
};
```

## Decrypt

```rust
use playfair_cipher::{PlayFairKey, CharNotInKeyError};

let pfc = PlayFairKey::new("playfair example");
match pfc.decrypt("BMODZBXDNABEKUDMUIXMMOUVIF") {
  Ok(crypt) => {
    assert_eq!(crypt, "HIDETHEGOLDINTHETREXESTUMP");
  }
  Err(e) => panic!("CharNotInKeyError {}", e),
};
```

That's it.