fix incompatibility between tensorflow and caffe on OSX 10.11 el capitan, due to the different protobuf versions, installed by brew for caffe and by pip for tf

caffe+tensorflow+el-capitan.sh

# follow instructions on http://caffe.berkeleyvision.org/install_osx.html except for protobuf, where you should use --devel and not use --with-python because it is the default behaviour
brew install --devel protobuf #basically you are installing protobuf 3.0, the same checked by pip for tensorflow
# continue with caffe installation, after make all and before make runtest, set the right linking lib location
install_name_tool -change libcaffe.so.1.0.0-rc3 @rpath/libcaffe.so.1.0.0-rc3 .build_release/test/test_all.testbin
install_name_tool -change libcaffe.so.1.0.0-rc3 @rpath/libcaffe.so.1.0.0-rc3 .build_release/tools/caffe
install_name_tool -change libcaffe.so.1.0.0-rc3 @rpath/libcaffe.so.1.0.0-rc3 .build_release/lib/libcaffe.so
# run make runtest, if everything is ok, before running make pycaffe set the right linking location for python
install_name_tool -change libcaffe.so.1.0.0-rc3 @rpath/libcaffe.so.1.0.0-rc3 /Users/imac/caffe/python/caffe/_caffe.so
# make pycaffe; cd caffe/python; try to run python >>>import caffe, if it works you are on the run, add pycaffe to env for import caffe
PYTHONPATH=/path/to/caffe/python:$PYTHONPATH
# caffe is now working, to install tensorflow you simply need to pip install it
pip install --upgrade https://storage.googleapis.com/tensorflow/mac/tensorflow-0.5.0-py2-none-any.whl
# everything should just work now