plugin account: modifications in welcoming email: - removed "it misses some features and it's not stable enough to be used for any serious purpose." as we are being more and more close to general audience version - removed the reference to http://salut-a-toi.org/faq.html#certificate as we have no more certificate warning since the move to let's encrypt on the demo server

Use this module to temporary store files that need to be integrated to other
projects such as Wokkel.

For example, the changeset that introduced this folder adds RSM (XEP-0059)
support to Wokkel. The files in sat.tmp.wokkel are imported over the initial
wokkel files from sat.plugins.__init__.py