add a func to get the version of the loaded leveldb
Merge pull request #20 from influxdb/leveldb-version

add a func to get the version of the loaded leveldb
better docs about Options re-use
fix win32 error
Merge pull request #26 from runner-mei/levigo

fix win32 error
Merge branch 'master' of https://github.com/jmhodges/levigo