[shell] Add FZF_CTRL_T_COMMAND for CTRL-T

Close #40

shell/key-bindings.zsh

@@ -4,10 +4,11 @@ if [[ $- =~ i ]]; then
 
 # CTRL-T - Paste the selected file path(s) into the command line
 __fsel() {
-  command find -L . \( -path '*/\.*' -o -fstype 'dev' -o -fstype 'proc' \) -prune \
+  local cmd="${FZF_CTRL_T_COMMAND:-"command \\find -L . \\( -path '*/\\.*' -o -fstype 'dev' -o -fstype 'proc' \\) -prune \
     -o -type f -print \
     -o -type d -print \
-    -o -type l -print 2> /dev/null | sed 1d | cut -b3- | $(__fzfcmd) -m | while read item; do
+    -o -type l -print 2> /dev/null | sed 1d | cut -b3-"}"
+  eval "$cmd" | $(__fzfcmd) -m | while read item; do
     printf '%q ' "$item"
   done
   echo