have the module included directly from its functor application
add build-dep to ocamlfind

new in opam 1.2 : https://github.com/ocaml/opam/pull/1523
update travis support with additional PPAs from avsm, and add 4.02 support
Merge branch 'master' of github.com:amnh/phylocaml
add gfortran to dependencies
update interfaces; remove unnecessary code; remove maximum likelihood tcm for now
Merge branch 'cost-matrix-interface'
Merge branch 'master' into appveyor-support
correct name of libgfortran in cygwin