Revert "remove _j() as it was never used to begin with."

This reverts commit 49a0d702ba.

Conflicts:
	bin/autojump

Closes #178, #181.

bin/_j

@@ -0,0 +1,6 @@
+#compdef j
+cur=${words[2, -1]}
+
+autojump --complete ${=cur[*]} | while read i; do
+    compadd -U "$i";
+done

bin/autojump.zsh

@@ -37,6 +37,7 @@ chpwd_functions+=autojump_chpwd
 
 function j {
     # Cannot use =~ due to MacPorts zsh v4.2, see issue #125.
+    echo "j()"
     if [[ ${@} == -* ]]; then
         autojump ${@}
         return
@@ -54,6 +55,7 @@ function j {
 }
 
 function jc {
+    echo "j()"
     if [[ ${@} == -* ]]; then
         j ${@}
     else