add xmldiff 0.3.0
typo in opam file
update xmldiff 0.3.0 url
fix syntax error in opam file
fix build
add xtmpl 0.10 and tighten previous versions contraints (ocaml < 4.02)
forgot to add xtmpl.0.10
update url for fixed archive
Merge pull request #2754 from zoggy/master

Add xmldiff 0.3.0