Renamed src package to sebimachine.

- Gave the package a descriptive name.
- Passed over with black once more.
- Created setup.py to install dependencies.
- Updated author to reflect repo ownership to Dusty.
- Changed `git` command to use the __url__ attribute.
- Changed music to use ogg vorbis instead of mp3, purely for
    performance.
- Tried to make sure nothing broke.
- Updated dockerfile. Pretty sure we don't need it though...

dockerfile

@@ -16,4 +16,4 @@ RUN python3.6 -m pip install --upgrade pip && \
     python3.6 -m pip install -r requirements.txt && \
     python3.6 -m pip install -U git+https://github.com/Rapptz/discord.py@rewrite#egg=discord.py[voice]
 
-cmd ["python3.6","-m","src"]
+cmd ["python3.6","-m","sebimachine"]