Fixes #8: unable to remove records
Added `Mongo.close`
Allow class instances to be BSON encoded
Merge branch 'fix-issue-8' into improvements
Fixes #9: int64 must be serialized in little-endian
Rewrites MongoDate (now an abstract over Date) and its BSON
encoding/decoding; fixes Date support in the driver, but this
implementation is dependent on platform precision for Date
Merge branch 'fix-issue-9' into improvements
Merge branch 'fix-dates' into improvements
Merge pull request #15 from jonasmalacofilho/fix-dates

Fix dates
Merge pull request #13 from jonasmalacofilho/fix-issue-8

Fixes #8: unable to remove records
Merge pull request #14 from jonasmalacofilho/improvements

Possible improvements
Updating for version 0.8.3