TinkerforgeBinding:  bugfix: missing updates when symbolic name is used
TinkerforgeBinding:  fix doc string
TinkerforgeBinding:  update tinkerforge api to 2.1.1
Merge remote-tracking branch 'upstream/master' into TFintegration
Merge pull request #1219 from theoweiss/TFintegration

TinkerforgeBinding: Bugfix and upgrade of TinkerForge api