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Merge pull request #117 from rixed/syntax

A lesson to help beginners dodge various syntax traps
Update lessons
fix typo
Merge pull request #119 from rixed/typo

fix typo
Merge pull request #121 from cago/without_js_of_ocaml

Fix/Update lessons
Update for 4.01 and new version of ocp-build
Merge pull request #123 from lefessan/without_js_of_ocaml

Without js of ocaml
Merge branch 'without_js_of_ocaml'

Conflicts:
	ocaml-lessons/lesson5/step5/step.html
update readme
update README
ocp-jslib/Graphics : Added loop_on_exit, improvements on open_graph (now opens a new window, or under the toplevel if specified and some drawing functions corrected
Merge pull request #124 from pcouderc/master

Improvements on ocp-jslib/Graphics