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This release integrates plonesocial.network.
* update docs [gyst]
* fix dependency [gyst]
* reindent for better pep8 [gyst]
* enable plone.app.discussion by default for Documents, Events and News Items [gyst]
* flush_queue is now public [gyst]
* setup demo graph [gyst]
* demo users + microblog updates [gyst]
* link plonesocial.network [gyst]
* integrate plonesocial.network [gyst]
* GS name and plonesocial.network [gyst]
* version bump to 0.4 [gyst]