Make all tokens case classes
New style tokens now have embedded offsets
s/not/isNot/g
Adt-ify new-style tokens
Remove extra curly braces
Alias in.next for brevity
Merge pull request #53 from densh/topic/tok-offset

Embed offset in new-style tokens
removes Origin, moves Source to scala.meta.syntactic.parsers
temporarily removes Unquote

it's not used anywhere anyway
same about Quote
Mod.ValParam and Mod.VarParam are gone
Mod.Package is gone as well
Qual.Term and Qual.Type are gone, Qual.Super is now Term.Super
all the variety of Stmts is reduced to just Stmt, then Stmt => Stat
removes names that actually aren't names, but are just unhygienic strings