Update submodule tmuxifier 2aa549f...6f98020

* tmuxifier 2aa549f...6f98020 (8):
  > Bump version to 0.11.6
  > Merge pull request #50 from jimeh/fix-new_window-active-window-tracking
  > Improve wording of comment
  > Clean up structure of initialize_session helper function
  > Add travis build status to readme
  > Merge pull request #46 from jimeh/add-tests
  > Bump version to 0.11.5
  > Fix issue where EDITOR contains flags