Use Twitter OAuth instead of username / password

Twitter doesn't accept username / password anymore hence we should
cut over to oauth for now to allow users to use twitter streaming.

Closes #6
Fix up badarg error msg.
Add stream credentials dialog and storage with support for twitter.
Merge branch 'pull/7'.  Thread twitter authinfo.

Conflicts:
	src/stream2es/stream/twitter.clj
Remove opts listing.
Add oauth usage for Twitter.