Drops created with Date

[jm42]

Description

Allows drops to be created passing Date objects to startDate, endDate and expiryDate instead of formatted strings.

Fixes #65

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update (if none of the other choices apply)

Checklist

• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [x] I have updated the documentation accordingly.

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