Also extend default jump labels

Related: #555

jump and jump-accept implement EasyMotion-like movement in fzf.
Suggested by @mhrebenyuk. Close #569.

Close #571

Should wait until execute action completes

The width of the pseudo-terminal on Travis CI environment can be small
and cause the line to be wrapped.

Close #570

Close #560, #561

Related: #559

Fix missing reference to UNAME_M

The `Build on $(UNAME_M) is not supported, yet` message was referencing an undefined UNAME_M. Fixed that.

Helps when your `$SHELL` is slow.

Close #552.

e.g. Remapping fzf-file-widget to CTRL-X CTRL-T intead of CTRL-T

    bind -x '"\C-x\C-t": fzf-file-widget'
    bind '"\C-t": transpose-chars'

- fzf-file-widget
- fzf-history-widget
- fzf-cd-widget

Related: 23244bb4

When we prepend a single quote to our query in --exact mode, we are not
supposed to limit the scope of the new search to the previous
exact-match result.

[bash] Update completion.bash

[bash] Update key-bindings.bash

Faster startup. Use internal bash globbing instead of external grep binary (adapter from Gentoo's `/etc/bash/bashrc` TERM checking). Insignificant on Linux, but on Cygwin this cuts startup time by 40 ms on my Core i7 laptop.

Fixes #548. Avoid using a subshell in _fzf_defc().

Fix https://github.com/junegunn/fzf.vim/issues/128