Runtime error
Reported by @warmhug

Follow the doc of https://github.com/zddhub/opensse/wiki/How-to-train-data , when I run `extract` command, it throws errors:
```sh
$ sse extract -d ~/Database/SHREC12/ -f ~/Database/SHREC12/2012_filelist -o ~/Database/SHREC12/2012_
dyld: Library not loaded: @rpath/libopencv_core.3.2.dylib
  Referenced from: /usr/local/bin/extract
  Reason: image not found
```
My installation directory are `/usr/local/opt/opencv3/include`(actually in`/usr/local/Cellar/opencv3/HEAD-c1007c7/include`) and `/usr/local/Cellar/boost/1.63.0/include/boost`, they are homebrew's directory. 

Is this error because my installation directory is not appropriate?