Added Proof-of-Concept HiliteBridge to Ilastik

This node is an example for the communictation between Ilastik / KNIME.
The application may send and receive hilites to each other using
a simple protocol on top of TCP.

This node is work in progress.
Added NodeTools: Simple helpers for KNIME Node Development
IlastikHDF5Reader: Init commit.

This node allows to read files which were exported from Ilastik.
This node is under heavy development and work in progress.
plugin.xml: Added Nodes!