[Nant-developers] updates

[Gerry S. <ger...@ya...>]

- GPL header added to all source code modules
- mike's email changed in authors file
- using 4 character spaces (instead of tabs) - when browsing the CVS
source code it looks horrible with tabs
- integrated mike's CompilerBase refactoring and win32res option
 
portions of SourceForge are currently done for scheduled maintenance so
the web page will be updated at a later time.