typestub-node-lmdb

Typescript wrapper around node-lmdb, with some improvement.

Basically same as node-lmdb, except:

• beginTxn() is exposed only after the env is opened
• extended txn to include clear, getObject, and putObject methods

additional method	explanation
clear	try to delete, will not throw error if the key doesn't exist
getObject	wrap around getString with JSON.stringify*
putObject	wrap around putString with JSON.parse*

*: exception raised from JSON.stringify/parse is not handled