ability to specify minModificationTimeMillis as arg

[angadsingh]

as an argument to JobFilePreProcessor. Only files after this timestamp will be picked up. Still honor lastProcessRecord.

[vrushalic]

A minor improvement suggestion -maybe have a variable that stores the lastProcessRecord.getMaxModificationTimeMillis() since it is being called thrice in this code block?

[vrushalic]

Overall, this pull request looks good to me (except for the minor improvement suggestion)

[jrottinghuis]

Is millis the most user-friendly, least error prone way to get this argument ?
Wouldn;t it be better to get something in a more huma-readable form ?
Perhaps yyyymmddhhMMss or something like that ?

[vrushalic]

I actually think having a timestamp (long number) in epoch milliseconds is cleaner than a yyyymmdd etc format.

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