OS-js upgrade

[nopbyte]

After starting to check the implementation of the Logout, it became clear the way in which OS.js loads handlers (deprecated by now) has changed.

So, we need to discuss whether we envision to upgrade to the latest API within the project to avoid doing work twice.

These changes also imply to modify the installation scripts that we have, since they use the osjs node.js file instead of grunt to configure and install new modules.

For this, we should check the "bump version" updates here: http://community.os.js.org/

Any feedback on this? @cskiraly @doitdagi @muka