#142 - Add notion of flag

[asolovieff]

https://github.com/4sh/datamaintain/issues/142

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Unit Test Results

  54 files  +1    54 suites  +1   1m 5s :stopwatch: -12s 200 tests +5  199 :heavy_check_mark: +5  1 :zzz: ±0  0 :x: ±0 

Results for commit 426d21f9. ± Comparison against base commit 4dda367e.

:recycle: This comment has been updated with latest results.