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Added playlist feature for the itunes command: 
if a variable is passed and is valid - will play the playlist
if a variable is passed and is invalid(no such playlist) - will stop all playing
if no variable is passed will print all playlists available on the host

* Improve UX for Spotify commands in osx plugin

Spotify command UX is a bit weak for people who live and work almost entirely in shells.
- `spotify quit` should not open Spotify if it is not already running. Should confirm that Spotify is indeed not running.
- `spotify quit` should not blow away the user's shell once Spotify is quit. This can be a disruption to work flow.

This PR looks to add a few little checks which will help improve this experience.
This PR also adds a space to line 477 between `break` and `;;` for consistency. Doesn't seem like a big enough change to put in its own PR.

* Rearranging output as per peer feedback

* osx plugin's spotify: change quitting w/ closing

Closing is more idiomatic English.

* initial spotify control

* volume up/down added

* add info, share and status option

* add color echo

* change pause to play/pause

* add Search Option for album,artist and tracks

* add search option for playlist

* fix showStatus output

* complete help

* readme updated

* seach show Url of song

Fixes the "syntax error: expected line end ..." (-2741) when using the tab, split_tab and vsplit_tab commands in iTerm2 v3

Related: #5179

* Modifies ofd to use alias to open_command instead of shell function with AppleScript

* Add ofd() to OSX plugin to open finder on current directory

* Change `pwd` to $PWD in osx.plugin.zsh
  Suggested by mcornella

Fixed indentation

Fixed indentation

Added function to display the song you're currently listening to in iTunes

Fixed indent

Indentation on line 169 was squiffy

Fixed spelling

Removed unnecessary wording to make function more succinct.

Highlighting of Artist and Track

Changed the highlighting of the Track and Artist in yellow to make use of Prompt Expansion Colors

Remove redundant semicolon to make tab() works better in ITerm 2.

error messages are not discarded.

Added shuffle functionality to the itunes command in the OSX plugin.
iTunes 12 doesn't support setting the "shuffle" property on the playlist
from what I've read, so this simulates the user interacting with the
iTunes interface. The toggle option "clicks" the shuffle button in the
Now Playing area. This has the effect of toggling the shuffle setting on
whatever is currently playing. The on and off options use the Shuffle
menu bar items.

Usage: itunes shuffle [on|off|toggle]

I have been continually having problems with the "trash" function provided by the osx plugin, getting this error:

    trash:local:2: not valid in this context:

It seems like adding quotes around the assignment in [osx.plugin.zsh#L142](https://github.com/robbyrussell/oh-my-zsh/blob/master/plugins/osx/osx.plugin.zsh#L142) fixed my problem.

Does this look good to you? Thanks!

Adds itunes vol, which takes an argument from 0 to 100 to set the
volume from the shell.

Spelling correction in itunes control function.

Added vsplit_tab and split_tab for iTerm. Create new session within a vertical/horizontal split of the tab respectively.

Add helper aliases for show/hide files. Add helper alias to recursively delete
.DS_Store files.