first pass at adding heroku deploy/update tasks
[heroku] add notice about netrc
[heroku] add db:migrate/restart to update
[heroku] error when missing app argument to update
[heroku] local repo usage

remove tmpdir repo usage
stop modifying git remotes
Allow groups in fever to be marked as read
ignore case comparing fever api_key
Add a new rake task to clean up old, read stories

A new rake task has been added: cleanup_read. This will delete
the oldest 1000 read stories in the database. You can pass in a different
number of stories to delete as an argument to the rake task.

rake cleanup_read[50]
Change cleanup task to remove stories based on a cutoff date

The cleanup task now takes an optional "number of days" argument
and defaults to one week otherwise. It will delete read, unstarred
stories older than the cutoff date.
cleanup formatting
Use If-Modified-Since Header when refreshing feeds

Fetch feeds with the If-Modified-Since HTTP header set to the last refresh timestamp.
This should save us (and the feed providers) quite some traffic since we don't have the fetch the whole feed when the content hasn't changed
Merge pull request #220 from wwwjfy/master

Ignore case comparing fever api_key
add readme section for cleanup task
make remove! a class method
change to query based on published date instead of created_at
add basic test
Merge pull request #219 from jmazzi/feature/fever_mark_group_read

Allow groups in fever to be marked as read
Merge pull request #224 from mherb/fetch-feed-caching

Use If-Modified-Since Header when refreshing feeds
update readme; collapse specs; rename task
Merge branch 'pr/223'