only act on "real" content changes. fixes #8 #9

When comparing the HTML output, we now strip all tags and whitespaces.
This should ensure only "visible" text data will create new revisions,
not slig

only act on "real" content changes. fixes #8 #9

When comparing the HTML output, we now strip all tags and whitespaces.
This should ensure only "visible" text data will create new revisions,
not slightly changed CSS or invisible data attributes.

Note this will create new revisions on all pages when updating (because
the old md5 cache will no longer match the new one).

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handle revisions regardless of rewriting. fixes #4

move action.php to action/save.php

store rendered revisions

This adds an option to store the rendered output for new revisions.
Opening a revision with stored HTML from the page revisions view will
show the stored output.