Merge pull request #61 from reflog/master

Added 'hide empty feeds' feature
Add some developer notes
Make ourselves and updater backend
Mimic google reader show unread behavior

Which is to not care about no unread or all items mode.

fixes #73
Merge branch 'master' of github.com:mjibson/goread
Stop querying and just generate keys to delete
/_ah/stop handler
Commit old backend handler
Stop worrying about deleting
Enable intelligent last time setting on mark all read
setYesterday admin function
Updated preview image
Date formats - remove some scary ones, too
Date formats
Go insane trying to find this bug

These are all designed to throw errors we can search for when a feed
without a URL is Put.
Remove old backend code
Disable this again
Ohh I found you

This looks culprity: forgot to check for other errors. Theory: the Get
failed and cleared everything in &f, but we proceeded and created empty
Feeds. Fix it twice: check for all errors and use f.Url instead of url so
we guarantee failure if we miss setting f.Url again.
Open feed URL in new tab
Don't select a folder when clicking on the icon