Added BigDecimal, Date, and Time types

Closes #88.

Signed-off-by: Dane Jensen <dane@rightscale.com>
Throw in arbitrary BigDecimal precision of 10 when loading Float values.

Signed-off-by: Dane Jensen <dane@rightscale.com>
Fix handling of invalid values for DateTime.load

Signed-off-by: Dane Jensen <dane@rightscale.com>
Merge pull request #94 from careo/extra-types

Added BigDecimal, Date, and Time types