Add support for building an extra debuggable bootimage for user builds

user-builds can't be debugged, and sometimes we just need to do
that...
Generate the debug bootimage after archiving the build.prop

We don't want to store a build.prop with the wrong tags...
Fix typo
Ignore fastboot zips when extracting the build.prop file
Merge branch 'master' of git://github.com/CyanogenMod/hudson

Conflicts:
	build.sh