Regenerated gemspec for version 0.3.2

Regenerated gemspec for version 0.3.1

Regenerated gemspec for version 0.3.0

Regenerated gemspec for version 0.2.0

Regenerated gemspec for version 0.1.2

Regenerated gemspec for version 0.1.1

Removed Date as a key type as it is not supported by the mongo ruby d…

…river currently. Should probably just map it to time so it can still be used.