Add Maximilian Knespel to Developers

Congrats and welcome @mxmlnkn! :)
Merge pull request #331 from ax3l/doc-addKnespel

Add Maximilian Knespel to Developers
remove unnecessary current variable
Move DomainInformation to MovingWindow
Merge pull request #333 from PrometheusPi/fixSumCurrents

remove unnecessary variable in SumCurrents plugin
Merge pull request #334 from f-schmitt-zih/topic-cleanDomains

+1
INotify Interface

Notification in PlguinController can in principle work without
registration. This is a rewrite to allow a bit more flexibility.
Fix Docstring (thx @f-schmitt-zih)
Merge pull request #336 from ax3l/topic-pluginINotify

INotify Interface