cleanup docker file

Dockerfile

 FROM python:3.6
 
 ENV INSTALL_DIR /orcasong
-ADD . $INSTALL_DIR
+
+COPY . $INSTALL_DIR
+RUN pip install --upgrade --no-cache-dir pip setuptools wheel
 RUN cd $INSTALL_DIR && make install
-RUN echo "ORCASONG\n"
-WORKDIR /orcasong
-ENTRYPOINT /bin/bash
+RUN cd / && rm -rf $INSTALL_DIR