+ extlib.1.6.1 extlib-compat.1.6.1

extlib-compat has all modules and is backwards-compatible, extlib is
stripped of conflicting modules, recommended
alternative (extlib | extlib-compat) dependency
add swdogen.0.1.0 to opam
ounit is required
Add version 0.7.1 of ocamlyices (hotfix)
Merge pull request #1351 from polazarus/master

Add version 0.7.1 of ocamlyices (hotfix)
Merge pull request #1350 from vbmithr/master

Add menhir as a dependency for js_of_ocaml.
Merge pull request #1349 from dotcy/master

add swdogen.0.1.0 to opam
Merge pull request #1338 from camlunity/master

introduce extlib-compat
Reverted menhir dep for js_of_ocaml.