Add README for OSX plugin and refactor plugin file

plugins/osx/README.md

+# OSX plugin
+
+## Description
+
+This plugin provides a few utilities to make it more enjoyable on OSX.
+
+To start using it, add the `osx` plugin to your plugins array in `~/.zshrc`:
+
+```zsh
+plugins=(... osx)
+```
+
+Original author: [Sorin Ionescu](https://github.com/sorin-ionescu)
+
+
+## Commands
+
+| Command       | Description                                    |
+|:--------------|:-----------------------------------------------|
+| `tab`         | Open the current directory in a new tab        |
+| `ofd`         | Open the current directory in a Finder window  |
+| `pfd`         | Return the path of the frontmost Finder window |
+| `pfs`         | Return the current Finder selection            |
+| `cdf`         | `cd` to the current Finder directory           |
+| `pushdf`      | `pushd` to the current Finder directory        |
+| `quick-look`  | Quick-Look a specified file                    |
+| `man-preview` | Open a specified man page in Preview app       |

plugins/osx/_man-preview

-#compdef man-preview
-#autoload
-
-_man
-

plugins/osx/osx.plugin.zsh

-# ------------------------------------------------------------------------------
-#          FILE:  osx.plugin.zsh
-#   DESCRIPTION:  oh-my-zsh plugin file.
-#        AUTHOR:  Sorin Ionescu (sorin.ionescu@gmail.com)
-#       VERSION:  1.1.0
-# ------------------------------------------------------------------------------
-
 # Open the current directory in a Finder window
 alias ofd='open_command $PWD'
 
@@ -154,14 +147,6 @@ function pfd() {
 EOF
 }
 
-function ofd() {
-  osascript 2>/dev/null <<EOF
-    tell application "Finder" 
-      open POSIX file "$PWD"
-    end tell
-EOF
-}
-
 function pfs() {
   osascript 2>/dev/null <<EOF
     set output to ""
@@ -190,6 +175,7 @@ function quick-look() {
 function man-preview() {
   man -t "$@" | open -f -a Preview
 }
+compdef man-preview=man
 
 function vncviewer() {
   open vnc://$@