ERP5 SR: Add Jinja2 to the explicit list of eggs.

Jinja2 is used inside of ERP5 (scalability tests).
So we need to explicitely add it, even if we already download it, otherwise it seems buildout keeps it for its own internal use.
Add pylint to erp5 SR required to check source code of ZODB Components.
Merge branch 'erp5'