[Vim] Enable list continuation for Git commits
[Vim] Add tests for markdown#OpenLine()/pass them
[Vim] Change Conceal highlight in styx.vim
[Fish] Do not hard-code username
[Fish] Remove obsolete entry for Cask in PATH
[Fish] Remove custom key binding

The default of \ce to accept the autosuggestion is preferred.
[Fish] Use prepend_to_manpath function