Fix ocamldoc
Add `Uri.get_query_param` which returns a list of values associated with a query key.
bump oasis to 1.3.8
Add `Uri.get_query_param` which selects a single value for a query key.

Suggested by @dsheets
tag 1.3.8
tweak query param semantics; @dsheets
Fix compiler-libs dependency to work with OCaml ≥ 3.12.
Merge pull request #20 from Chris00/master

 Fix compiler-libs dependency to work with OCaml ≥ 3.12.
Merge branch 'master' of github.com:avsm/ocaml-uri
Add #20 to CHANGES
add some ocamldoc
trim trailing whitespace
bump to 1.3.9
release 1.3.9
Rename `Install_printer` to `Uri_top` to prevent conflict with other libraries with similar name

Closes #24
add Travis tests
correct opam deps
add ounit to tests