Added base for UpdateNetwork component

Added component in CMakeLists.txt in Component directory.
Added directory for UpdateNetwork.
Added UpdateNetwork component class with default methods to match DisCODe
compatibilities.
Added input dataport

Added input dataport with DSL_Network.
Removed method addNode.

Wrong arguments, method redundant in this branch.
Added method observeNode()

Setting node as observed based on node name.
To set node as observed you have to know number of outcome,
which is being observed.
Fixed event handler.

Check porting to newer version of DisCODe:
http://robotyka.ia.pw.edu.pl/twiki/bin/view/Software/DisCODe/Porting
Added method clearEvidence()

removing all observarions from network.
Added method changeNodeCPT

allowing to set new CPT of the node with given name
in runtime.