Improve performance of numeric parsers

by parsing to Scientific numbers
Update benchmarks
Backport Bas's number benchmarks
Drop attoparsec library dependency
Merge

--HG--
extra : amend_source : 4537d65463b25bd79dfa61bf69561497186c0a08
Drop upper bound on scientific

We hates upper bounds, precious, yes we does!
Bump version to 0.11.0.0