Prevent possible crash on pages with iframes.

In some cases, setupFrame() has not been invoked (due to the queued
signal-slot connection) after the frame is destroyed and thus leads
to the crash. We prevent this from happening by making sure it is a
direct connection instead and therefore setupFrame() will be executed
as soon as possible.

Investigation + patch by Vitaliy Slobodin <vitaliy.slobodin@gmail.com>.

http://code.google.com/p/phantomjs/issues/detail?id=947
Updated help output to prefer true/false to yes/no

Similarly, I updated the API Reference too:
https://github.com/ariya/phantomjs/wiki/API-Reference/7cddd19676a917535b74d386c3974da00fbbe793

This arguably makes more sense to PhantomJS's typical audience of web developers.
Merge branch 'patch-3' of github.com:JamesMGreene/phantomjs