Please add lmdb

[eudoxia0]

This is a higher-level binding to LMDB

https://github.com/antimer/lmdb

[quicklisp]

Hung up on problems building liblmdb for now.

[quicklisp]

Got it going. It was a minor pain to get liblmdb.so, but not so bad that I gave up on it.

[eudoxia0]

Thanks for taking the time to build it.