Change `friends_timeline` to `home_timeline`.

To be compatible with Twitter API v1.1. Not sure they're exactly
the same -- `home_timeline` includes the user's own tweets -- but
it's as close as we get I think.
Change `statuses/mentions` to `statuses/mentions_timeline`

To be Twitter API v1.1 compatible.
Fix error messages when fetching tweets.

Looks like the error format changed, or our code was already wrong.
Ignore all json files
Remove debug output
Change `favorites` call to `favorites/list`.

To be Twitter API v1.1 compatible.