Get ready for 1.8.2.

http://code.google.com/p/phantomjs/issues/detail?id=863
Collect the list of 1.8.2 bug fixes (backported from 1.9).

http://code.google.com/p/phantomjs/issues/detail?id=863
ChangeLog: Include the superimportant iframe crash fix.

http://code.google.com/p/phantomjs/issues/detail?id=863
Merge remote-tracking branch 'upstream/1.8' into 1.8

* upstream/1.8:
  ChangeLog: Include the superimportant iframe crash fix.
  Collect the list of 1.8.2 bug fixes (backported from 1.9).
  Get ready for 1.8.2.