Don't try to tap homebrew/science (#1572)

homebrew/science is now deprecated, but opencv and hdf5 are now both in homebrew/core, so can be installed without tapping homebrew/science.

scripts/osx/install_deps.sh

 brew install openblas
 brew install -vd snappy leveldb gflags glog szip lmdb
-# need the homebrew science source for OpenCV and hdf5
-brew tap homebrew/science
 brew install hdf5 opencv
 # with Python pycaffe needs dependencies built from source
 #brew install --build-from-source --with-python -vd protobuf
@@ -11,4 +9,4 @@ brew install protobuf boost
 brew install cmake
 brew install viennacl
 sudo pip install numpy
-sudo pip install opencv-python
\ No newline at end of file
+sudo pip install opencv-python