Extract author

[Petr Kaleta]

Find first valid value (trimmed length in interval 0..100) of:

1. meta[name="author"]
2. [rel="author"]
3. [class="author"], [class="writer"], [class="writtenby"]
4. [id="author"], [id="writer"], [id="writtenby"]

[Sam Snelling]

Looks like we're getting support in #49

[Adam Geitgey]

Check out v1.0.0 and see if it meets your needs! :)