Switched out the Twitter consumer key and secret for an API consumer key and
secret to allow for posting to Twitter as well as reading and querying.
Updated the example config file to reflect this.

Added documention of Tweepy's data structure for returned Twitter trends.
Their docs suck.

Reformatted an error return in exocortex.py slightly.

Fixed a missing format token in the help return code.  Fixed some help text.

Got trend searches on Twitter working.  Had to reverse engineer Tweepy's data
structure to do it.  Twitter throttling API access is a different matter
entirely.

Signed-off-by: The Doctor <drwho@virtadpt.net>