Release Candidate for the LRP Toolbox 1.3.0

Working on Code is done, functionality complete.
Documentation still needs to be updated for version 1.3.0

New in this version:

For python:

• update to python 3
• update treatment of softmax and target class
• lrp_aware option for efficient calculation of multiple backward passes
• custom colormaps (used in publications) available in render.py

For caffe:

• new formula types 100, 102, 104
• new python wrapper to use lrp in pycaffe
• convenience functions for the python wrapper + demo file (lrp_python_demo.py)
• updates for the installation config
• bugfixes