updated roadmap, scope and migration documents

Just a quick heads up, I've tidied up the pages a little on the wiki to  
give a more clear overview of the scope of 1.0, 2.0 of the JSR as well  
as the roadmap & the migration guide from Classic -> New Groovy...

http://docs.codehaus.org/display/GROOVY/Roadmap
http://docs.codehaus.org/display/GROOVY/ 
Migration+From+Classic+to+JSR+syntax
http://docs.codehaus.org/display/GroovyJSR/Scope

James
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