Impement SequenceIterator
Add Sequence::iterator() method
Make current() invokeable without side-effects
Refactor: Extract util.XPIterator adapter to its own class
Test Sequence::of() with Sequence::iterator()
QA: Use fully qualified class names only in use and declaration
Optimize case when SequenceIterator is wrapped in a PHP iterator
Make iterator() a terminal: Wrap exception messages
QA: Rename SkipTest -> SequenceSkipTest
Merge pull request #16 from xp-forge/feature/iterator

Feature: iterator