v1.5.3 - One To Many rollup adjustments, MIN/MAX bugfixes

[jamessimone]

• Updated documentation in README, and added link to Wiki there
• Fixes Batch rollups occasionally fail with query error #306 by preventing Ultimate Parent rollups from incorrectly querying the UltimateParentLookup__c before arriving at the parent-level object
• Fixes Exception Thrown "Invalid conversion from runtime type Date to Decimal" during Full ReCalc #307 by correctly passing subclasses of RollupCalculator.DecimalRollupCalculator the converted values for Date, Datetime, and Time instances

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This discussion was created from the release v1.5.3 - One To Many rollup adjustments, MIN/MAX bugfixes.