Corrected default value for disk-cache help

Fixes http://code.google.com/p/phantomjs/issues/detail?id=908
Added myself to the copyright list
Fix compilation on Windows.

We need to include QtCore/qt_windows.h on Windows since Q_PID mapped to
_PROCESS_INFORMATION, but _PROCESS_INFORMATION not defined.

Issue:
http://code.google.com/p/phantomjs/issues/detail?id=219