Support for DateTime mapper functions

[mellistibco]

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[x] feature request
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[] general question

Current behavior (how does the issue manifest): Currently there is no way to calculate date/time using Flogo. For example, consider querying a datastore and setting the query conditions to now and now-5 mins. This is not possible today.

Expected behavior: Calculate datetime offsets, now, now-(5min), etc.

What is the motivation / use case for changing the behavior? Support for datetime calculations to produce queries for database ops, etc.

[mellistibco]

@fm-tibco should we look at introducing a date, time & datetime type (or some combo of)? Perhaps we can just serialize as strings for now?

[ayh20]

@mellistibco Can we have "user" definable functions for this sort of thing (as well as a decent of predefined ones) .... then we can all contribute ;-)

[mellistibco]

@ayh20 tracking via #215