implemented first scratch of tip and users overview https://github.com/globaleaks/GlobaLeaks/issues/60
Merge branch 'master' into feature/overview
Merge branch 'master' into feature/overview
Merge branch 'master' into feature/overview

Conflicts:
	globaleaks/rest/api.py
validation of tor socks enabled only when enabled
restored security checks and typo fixed
Merge pull request #90 from globaleaks/feature/overview

System overview