Most of nanos fix
Using utility function for creating timestamps
More nanos cleanup
Remove testUpsertFloat as it's causing merge nightmares
More nanos testing
Remove nanos test
Added test for timestamp
Fix for UpsertValuesTest.testTimestampAddSubtractArithmetic()
Rest of nanos fix
Add missing expressions to ExpressionType and increase version to 2.2.0
Don't coerce TIMESTAMP to TIME/DATE