Added caolan's async.js lib
Deprecated src/async.js

Use caolan's async.js in lib
Deprecate various functions, update references

Image augment code now happens in fetchFeed. Entry content augment code
now happens in fetchFeed. Entry filtering (for content update) now
happens in fetchFeed. Deleted references to deprecated files in
dependencies.
Added a blacklisted selector
Deprecated findByLink

It is now a part of the one caller that used it, fetchFeed.
Minor comment change
Minor comment change
Minor whitespace changes
Minor comment change
Minor comment changes
Large refactor

Use new async module. Inline how entry content is updated and how images
are fetched. Organized and revised several comments. Properly continue
after a database error occurs.