Quote: add 'replace' command
Topic: allow configuring whether the separator is allowed in topics
Topic: run autopep8 on plugin.py
Quote: add tests for 'replace'
Merge pull request #974 from GLolol/topic-allow-separator

Topic: remove limitation forbidding the topic separator in topic.add
Merge pull request #973 from GLolol/quote-replace

Quote: add a 'replace' command
travis.yml: “It will make your build faster”, they say.
Revert "travis.yml: “It will make your build faster”, they say."

This reverts commit bc215d72be6184764f0ba28981739467dcabc03a.