e.g. fzf --bind "ctrl-m:execute:COMMAND..." --bind ctrl-j:accept

This can be used to avoid parse errors that can happen when the command
contains the closing character. Since the command does not finish at
a certain character, the key binding should be the last one in the
group. Suggested by @tiziano88. (#265)

  e.g. fzf --bind "ctrl-m:execute=COMMAND..." --bind ctrl-j:accept

enter (return), space, tab, btab, esc, up, down, left, right

    execute(...)
    execute[...]
    execute~...~
    execute!...!
    execute@...@
    execute#...#
    execute$...$
    execute%...%
    execute^...^
    execute&...&
    execute*...*
    execute:...:
    execute;...;
    execute/.../
    execute|...|

e.g. fzf --bind "ctrl-m:execute(less {})"
     fzf --bind "ctrl-t:execute[tmux new-window -d 'vim {}']"

This change does have positive effect on startup time of fzf when many
number of options are provided.

    time fzf --query=____ --filter=____ --delimiter=q --prompt=________ \
    --nth=1,2,3,4 --with-nth=1,2,3,4 --toggle-sort=ctrl-r \
    --expect=ctrl-x --tiebreak=index --color=light --bind=ctrl-t:accept \
    --history=/tmp/xxx --history-max=1000 --help

    0m0.013s -> 0m0.008s

:(

- Add `--history` option (e.g. fzf --history ~/.fzf.history)
- Add `--history-max` option for limiting the size of the file (default 1000)
- Add `previous-history` and `next-history` actions for `--bind`
    - CTRL-P and CTRL-N are automatically remapped to these actions when
      `--history` is used

Closes #249, #251

Do not rename terminal buffer

To avoid conflict with other neoterm plugins that manage terminals,
prefer named terminals.

Close #257

Merge branch '121-accept-nil-input' of https://github.com/dullgiulio/fzf into dullgiulio-121-accept-nil-input

Use ncurses's newterm instead of swapping stdout and stderr