Changed last_modified calculation to be a bit more specific #22
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Updated the README with details and provided examples.
Basically this refactor moves the calculation of last_modified to the Page/Post level, which allows for other Generator's Page/Post subclasses to provide a more accurate value. It's a bit convoluted when it comes to integrating with other coupling to other Generators so I'll understand if you choose to ignore this, but I thought it was useful so here it is.