added static lib output into .npmignore

better date type support

Collection level joins supported #43

"$addToSetAll" and "$pullAll" operations implemented

Fixed crash if null fields presented in queries

Fixed crash on sorting

#28 + NodeJS: renamed removeCollection() to dropCollection()

Optimized count(*) on whole collection (ticket #27)

Optimized $dropall on whole collection (ticket #26)
Database files can be opened directly from CLI command line