Restrict max-line-length to 120
Fix Pylint violations C0301
Fix Pylint violations W0301
Fix Pylint violations W0201
Fix Pylint violations W0511
Fix Pylint violations R0902, R0903
Fix Pylint violations W0232, W0403, W0613, W0621
Merge pull request #37 from sopel/issue-36-fix-pylint-violations

Fix Pylint violations

[Closes #36]