- Remove multiple mutex locks in partial cache lookup
- Simplify return values

Close #966

Related: #960 (relative filepaths)

Related #960, #552

With zero result.

Related: https://github.com/junegunn/fzf.vim/issues/22#issuecomment-311869805

This also modifies <C-t> behaviour.
The longest file path in the input is used as root directory for `find`
command. The remainder of the input is passed to fzf's --query as a
initial search parameters.

Fix found by @amosbird at https://github.com/junegunn/fzf/issues/953#issuecomment-310309055

closes #440

See #944

fzf should immediately continue consuming the buffer after discarding
bracketed paste mode sequence.

Close #951

If "." is given as the argument to begin <C-t> completion, the leading
"." is not correctly removed. In general, if user selects a fzf
completion, the current token should be "consumed".

Close #943

See https://github.com/junegunn/fzf/pull/933#discussion_r120011934

Close https://github.com/junegunn/fzf.vim/pull/386

Also change the example binding for `unix-word-rubout` to *ctrl-w* instead of *ctrl-u*

Close #935

- Update install script to download Windows binary if $TERM == cygwin
- Unset TERM if $TERM == cygwin (#933)
- Always use cmd.exe instead of $SHELL when running commands

Make sure to consistently calculate tiebreak scores based on the
original line.

This change may not be preferable if you filter aligned tabular input on
a subset of columns using --nth. However, if we calculate length
tiebreak only on the matched components instead of the entire line, the
result can be very confusing when multiple --nth components are
specified, so let's keep it simple and consistent.

Close #926

Related: https://github.com/junegunn/fzf.vim/issues/378