Use Hoa\Iterator\Map.
Add Hoa\Praspel\Iterator\Coverage global iterator

The Coverage iterator allows to make structural or structural+domain
coverage. To do this, the Structural iterator now implements the
Hoa\Iterator\Recursive interface.
This is a first draft, it may be optimized or updated.
[auto] Merge from Praspel

    • #b229c04 — Use Hoa\Iterator\Map. (Ivan Enderlin, 2013-05-13)
    • #bc23a63 — Add Hoa\Praspel\Iterator\Coverage global iterator (Ivan Enderlin, 2013-05-13)

---

Merge remote branch 'library-praspel/master'