PEP8 fixes

[moggers87]

Fixes #73 and many other PEP8 violations.

Still keeping the 120 char limit though.

[codecov-io]

Codecov Report

Merging #74 into master will decrease coverage by 0.09%.
The diff coverage is 90.69%.

@@            Coverage Diff            @@
##           master      #74     +/-   ##
=========================================
- Coverage   95.45%   95.36%   -0.1%     
=========================================
  Files          12       12             
  Lines        1386     1380      -6     
=========================================
- Hits         1323     1316      -7     
- Misses         63       64      +1

Impacted Files	Coverage Δ
salmon/bounce.py	100% <ø> (ø)	⬆️
salmon/view.py	100% <ø> (ø)	⬆️
salmon/handlers/forward.py	100% <100%> (ø)	⬆️
salmon/handlers/log.py	83.33% <100%> (ø)	⬆️
salmon/utils.py	90.27% <100%> (ø)	⬆️
salmon/commands.py	91.98% <100%> (-0.07%)	⬇️
salmon/mail.py	100% <100%> (+0.64%)	⬆️
salmon/encoding.py	95.97% <100%> (+0.01%)	⬆️
salmon/confirm.py	96.77% <100%> (ø)	⬆️
salmon/server.py	91.07% <33.33%> (-0.06%)	⬇️
... and 2 more

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