Merge pull request #107 from cago/master

Updates and fix
Merge pull request #108 from cago/master

Update js_of_ocaml
Merge pull request #109 from cago/master

Fix issue #105
Merge pull request #110 from cago/master

Fix english mistake
Fix english typo in js_of_ocaml lessons
Merge pull request #111 from cago/master

Fix english typo in js_of_ocaml lesson
Merge branch 'master' of github.com:OCamlPro/tryocaml into without_js_of_ocaml