- CTRL-D - delete-char/eof
- DEL - delete-char

Close #289

- Fix test failures on new fish 2.2.0
- Make timeout-based test cases more robust

Note that it still can't handle properly multi-line commands.
Thanks to @jpcirrus for the bug report and the fix.

[bash-completion] Fix g++: possible retry loop

See http://unix.stackexchange.com/q/213432/120177

Close #40

Since we now use fzf-tmux instead of tmux split-window

ALT-C can fail with the following aliases as pointed out in #272

    alias find='noglob find'
    alias command='command '

`--null` is ambiguous. For completeness' sake, we need both `--read0`
and `--print0`.

`--read0` only makes sense when the input contains multiline entries.
However, fzf currently cannot correctly display multiline entries,
I'm going to make `--read0` an undocumented feature.

Use vi-fetch-history on zsh to get history line

In addition to being simpler, it allows subsequent up/down history
or accept-line-and-down-history widgets to work.
Also allow for find being and alias if alias expansion
after command is enabled.

Since the same can be now achieved with --bind KEY:toggle-sort

Considering HISTSIZE and HISTFILESIZE of bash

Remember the exact string given as the key name so that it's possible to
correctly handle synonyms and print the original string.

by making sure that we're back on shell command-line

Close #266