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

* updated OSX plugin docs

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.

Reorganizing plugins so that each plugin has it's own directory now so that any plugin-specific functions can be bundled within there.