fzf 0.8.7

- fzf
    - Added CTRL-LEFT / CTRL-RIGHT key bindings (#80)
    - Fixed to ignore UTF-8 errors when displaying item (#91)
    - Improved performance of `--nth` option (#90)
- Fuzzy completion (bash)
    - Fixed to handle dynamically loaded completion functions (#79)
- Shell key bindings
    - Changed `--nth` option for CTRL-R (#90)
- Vim plugin
    - Apply FZF_DEFAULT_{OPTS,COMMAND} when using tmux splits (#87)