func (env *Env) Close() {
	C.leveldb_env_destroy(env.Env)
}
Close deallocates the Env, freeing the underlying struct.
package levigo
import "C"
type Env struct {
	Env *C.leveldb_env_t
}
func NewDefaultEnv() *Env {
	return &Env{C.leveldb_create_default_env()}
}