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. ;(
Could you change this to

```python
try:
    from urllib.request import urlretrieve
except ImportError:
    from urllib import urlretrieve
```
?

You'll also need to change the callsite of `urllib` below.