CVS commit by rdale: 


* Improved nil argument matching, and nil can match any type now
  not just classes. Translated the code from the Qt.pm in PerlQt,
  after discussion on the kde-perl list.
* Fixed bug in rbuic where a C++ 'QString::null' was "" in ruby, and
  should have been a nil.


  M +8 -0      ChangeLog   1.57
  M +4 -1      rubylib/designer/rbuic/uic.cpp   1.7
  M +37 -22    rubylib/qtruby/lib/Qt/Qt.rb   1.56