Added `character()` support for algorithmic names.

Partially addresses #2. The equivalent support for `name()` would need some changes to the API, since it needs to write to the user-supplied buffer. (Note that #1 equally needs this change, anyway.)

For your information, by the way, `urllib.request` is not in Python 2. ;(
```rust
return if generated::CJK_IDEOGRAPH_RANGES.iter().any(|&(lo, hi)| lo <= ch && ch <= hi) {
    Some(ch)
} else {
    None
}
```