Add Cargo support.
Fixing breakage due to move keywordification.
Merge remote-tracking branch 'origin/cargoify'
Add active_object to Cargo.
Merge pull request #229 from pythonesque/fix_build

Fixing breakage due to move keywordification.
Adding comments for active_object.
Merge remote-tracking branch 'theirs/master' into active_object
Merge pull request #231 from pythonesque/active_object

Active object
Merge remote-tracking branch 'theirs/master' into cargoify
Merge remote-tracking branch 'theirs/master' into cargoify
Removing custom Travis configuration.
Merge branch 'master' into cargoify
Added accumulator_factory
Merge pull request #232 from pythonesque/accumulator_factory

Added accumulator_factory
Merge branch 'master' of github.com:Hoverbear/rust-rosetta into cargoify
Added accumulator_factory to Cargo.
Added S-expressions.
Fixing negative numbers in s-expression parser.

The check to see if the first byte is 0..9 was added for performance (to
avoid trying to parse every literal as a number) but - was forgotten.  I
could have added other literals like + there as well, but I think - is
the only one that's actually required for non-"weird" floats.
Merge pull request #233 from pythonesque/sexp

Added S-expressions.
Fixing fallout from recent Rust changes.