Mor details about prepare_iso

How it needs to be run from clone.
Snow Leopard issue.
Merge pull request #20 from gotcha/patch-1

More details about prepare_iso
Build veewee-config.pkg as a Distribution package

- workaround for bug in Yosemite Installer (rdar://18491441, rdar://18493263)
- does not make a successful 10.10 install, but needs to be done regardless
Fix to keep only lines with *

Was broken with following  `softwareupdate -l` output:

Software Update Tool
Copyright 2002-2012 Apple Inc.

Finding available software
Software Update found the following new or updated software:
   * 031-00536-5.1.0.0
        Command Line Developer Tools for OS X Mavericks (5.1.0.0), 121492K [recommended]
   * Safari7.1Mavericks-7.1
        Safari (7.1), 59574K [recommended]
   * Command Line Tools (OS X Mavericks)-6.0
        Command Line Tools (OS X 10.9) (6.0), 104398K [recommended]
   * iBooksDelta-1.0.1
        iBooks Update (1.0.1), 14334K [recommended]
   * iTunesXPatch-11.4
        iTunes (11.4), 94992K [recommended]
Added parallels support
Merge pull request #22 from ayufan/topic/parallels

Added Parallels support
Fix user path for prl-tools
Merge branch 'master' into easier-renaming-of-vagrant-user
Use user variables in parallels builder.