Use Hash::StoredIterator to make %hash->each({...}) iterator safe

 * Safe to nest calls to each()
 * Safe to use keys() and values() inside each()
 * Does NOT copy all keys, uses internal iterator
Releasing perl5i v2.11.0
Merge branch 'master' into issue/235

Conflicts:
	META.json
	META.yml
Put the IRC channel back.

Discussion at https://github.com/schwern/perl5i/issues/235#issuecomment-14534585
says the IRC channel is still active.