add plugin safe-rm to replace rm with mv

plugins/safe-rm/safe-rm.plugin.zsh

@@ -0,0 +1,16 @@
+function rm () {
+  local files
+  local trash=~/.Trash/
+  for files in "$@"; do
+    # ignore any arguments
+    if [[ "$files" = -* ]]; then :
+    else
+      local dst=${files##*/}
+      # append the time if necessary
+      while [ -e $trash$dst ]; do
+        dst=$dst_$(date +%H-%M-%S)
+      done
+      /bin/mv $files $trash$dst
+    fi
+  done
+}