Replace Dumped Dates/times In data.sql With An Epoch Value

[paulrrogers]

Currently dumping data with schema may produce a data.sql file whose inserts vary only by the dates/times of when the migrations created the data. It would be nice to have an --epoch= option when dumping with data to replace those dumped dates-times with the provided value.

Possible solutions could be to manipulate the data in memory during the dump/export or temporarily update the data in a DB transaction beforehand. If there is no maintainable solution then it may be best to simply document the limitation in the README.md.