Implement PPT Reader

[Progi1984]

Documentation :

• http://msdn.microsoft.com/en-us/library/cc313106(v=office.12).aspx
• http://msdn.microsoft.com/en-us/library/gg615594.aspx
• http://msdn.microsoft.com/en-us/library/hh244173(v=office.14).aspx
• https://poi.apache.org/slideshow/ppt-file-format.html
• http://blogs.msdn.com/b/openspecification/archive/2009/10/19/beginning-with-the-powerpoint-document-stream.aspx
• http://blogs.msdn.com/b/openspecification/archive/2013/06/20/extracting-a-powerpoint-vba-macro.aspx
• http://blogs.msdn.com/b/openspecification/archive/2009/09/04/parsing-pictures-in-a-powerpoint-binary-file.aspx

Validator :

• http://www.technize.net/download-binary-file-format-validator-for-microsoft-office/
• http://blogs.msdn.com/b/openspecification/archive/2011/07/13/bffvalidator-tool-goes-public.aspx

[Progi1984]

Implemented in develop branch.

Travis fails in PHP 5.3.3. It seems it's a PHP-MD error : phpmd/phpmd#175 .

Job : https://travis-ci.org/PHPOffice/PHPPowerPoint/jobs/31325302