Remaining Emu references

[huard]

Description

The template includes references to Emu. Some of them are Ok but the ones in the Dockerfile are problematic.

grep -Ri emu \{\{cookiecutter.project_repo_name\}\}/
{{cookiecutter.project_repo_name}}/docs/source/dev_guide.rst:.. WARNING:: To create new processes look at examples in Emu_.
{{cookiecutter.project_repo_name}}/docs/source/dev_guide.rst:.. _Emu: https://github.com/bird-house/emu
{{cookiecutter.project_repo_name}}/docker-compose.yml:  emu:
{{cookiecutter.project_repo_name}}/Dockerfile:CMD ["source activate wps && exec emu start -b 0.0.0.0 -config /opt/wps/etc/demo.cfg"]
{{cookiecutter.project_repo_name}}/.travis.yml:  # Install Emu WPS
{{cookiecutter.project_repo_name}}/{{cookiecutter.project_slug}}/processes/wps_say_hello.py:                Metadata('User Guide', 'https://emu.readthedocs.io/en/latest/processes.html'),  # noqa