[http] support Cow and Cowabloga too
[mirage] revert addition of cowabloga etc

use add_to_opam_packages and add_to_ocamlfind_libraries instead
Merge branch 'master' of https://github.com/mirage/mirage
[mirage] fix FAT script generation to set SIZE appropriately
[lib] fix kv_ro_of_fs evaluating too early and picking up default mode=unix
Merge branch 'master' of git://github.com/mor1/mirage into mor1-master

Conflicts:
	lib/mirage.ml
Merge pull request #216 from avsm/mor1-master

kv_ro_of_fs bugfixes (part deux)