add breakpoint method as an alias for debugger in case breakpoint method is not defined already
add breakpoint method as an alias for debugger in case breakpoint method is not defined already


git-svn-id: 7ffbd09614c8d739a966cfae413e2c1c0f4cb91b@192 453b2852-3d18-0410-866e-d09c099698e4

ruby-debug/ruby-debug-extra,ruby-debug/ruby-debug-extra