Fix chunking

Merged Joonas Koivunen requested to merge koivunej/seahash:fix_chunking into master

Fixes #5 (closed) or chunking, and adds the tests which I used to hunt this down. The testing could be more thorough, like for example with quickcheck, but this should get things forward either way. Quickcheck tests added.

Edited by Joonas Koivunen

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