Option to override OR append content and minor formatting #6
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I added a configuration option for each feed to choose whether to override content or not (in which case, it just appends the content). This is useful for feeds that contain a summary that is either not available in the article page, or is not picked up by merc/read. It's nice to just get a summary if you don't care enough to read the whole article.
Also applied some standard PHP formatting rules in the files.