Docker

[gplassard]

Before submitting this pull request, please acknowledge that you have done the following:

• [x] I have tested my changes to make sure that they work
• [ ] I have at least attempted to write relevant unit tests to verify that my changes work
• [x] I have read through the contribution guidelines
• [x] I have written any necessary documentation (for example, adding information about a feature to the README)

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What type of pull request is this?

• [ ] Bug fix
• [ ] Typo fix
• [x] New feature implementation
• [ ] New service implementation
• [ ] Other

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Description of your pull request:

This pull request brings support for running mumbledj with docker

[codecov-io]

Current coverage is 46.12%

Merging #170 into master will not change coverage

@@             master       #170   diff @@
==========================================
  Files            36         36          
  Lines          1266       1266          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits            584        584          
  Misses          679        679          
  Partials          3          3          

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[matthieugrieger]

Looks good, thanks. :)