Merge pull request #48 from estebanlm/master

prepared to Pharo3
Merge pull request #50 from estebanlm/master

aligning sources with latest from Eliot
second try
kill them alll
change primitive to be translated
refix the atomic operation for arm
add a configuration of the method for the FFI plugin
Merge pull request #51 from JeanBaptisteArnaud/raspberrypi

Raspberrypi
merged