Moved some fetchFeed functionality into augmentEntries

Split up fetch-feed.js and the lucu.fetchFeed function. Augmenting of
entries now takes place in the new lucu.augmentEntries function. Updated
all lucu.fetchFeed callers and added augment-entries.js to html files.
Commented out a logging message

From testing the bug with unread count being left at 2 instead of 1 when
navigating to the last slide
Minor comment changes

Commented out a log message regarding removing the base tag. Rewrote
some of the comments.