Expand example_02: reporter nodes

-Streamlined cobramodels.py to remove functions that will not be used
in the release
-Improved node names in recon_1_nampy_v01.pickle
-Expanded example_02.py
-Improved txt file outputs used to build networks in Cytoscape
-Improved reporternodes
-Expanded networkstatistics
-Added IFNb stimulation example with Affy microarray annotation