More Dart - Literally

Various extension libraries that make Dart a better place.

• bit_set.dart provides a space efficent array data structure that compactly stores bits.
• char_matcher.dart provides a model for character classes, their composition and operations on strings.
• fraction.dart provides support for rational number arithmetic.
• int_math.dart is a collection of common mathematical functions on ints.
• iterable.dart is a collection of iterables and iterators.
• range.dart provides a function to create iterables yielding arithmetic progressions.

And there is more to come ...

Continuous build results are available from Jenkins.