examples/follow: Update Twitter handles.

https://code.google.com/p/phantomjs/issues/detail?id=1082
Update ChangeLog.

Also, includes changes from 1.8.x.

http://code.google.com/p/phantomjs/issues/detail?id=863
https://code.google.com/p/phantomjs/issues/detail?id=939
Change issue tracker link to point to the new one.

From now on, it's https://github.com/ariya/phantomjs/issues.

For the details, check this mailing-list discussion:
https://groups.google.com/d/msg/phantomjs/It04OsP7csU/Vw2cmJkAILUJ
Merge remote-tracking branch 'upstream/master'