Documentation updated. Renamed docs/dev/ to drafts/

--HG--
rename : docs/dev/2to3 => docs/drafts/2to3
rename : docs/dev/c10k.html => docs/drafts/c10k.html
rename : docs/dev/http => docs/drafts/http
rename : docs/dev/reference => docs/drafts/reference
Incremented version number to 0.42dev