Merge pull request #15 from clintongormley/master

Don't localize $@ in Perl < v5.14 as it caused $@ to be clobbered.
0.07
Merge pull request #17 from clintongormley/master

Wrap callbacks in an eval to ensure that exceptions get propagated
Renamed Recursion.pm to Recursion.pod
Added t/lib/NoEV to prevent the EV loop from being loaded during testing.
Added tests and documentation for exception handling in callbacks