Start making PHPExcel PSR-* compliant

[gabrielbull]

Reference

I believe some easy things could be done to start making PHPExcel PSR-* compliant.

• Only accept new pull requests that are PSR-1 and PSR-2 compliant
• Move source code to a src or lib directory
• Start implementing autoloading practices from PSR-4 , see examples

In the future

• Rename Namespaces and Classes to be PSR-0 compliant

[Progi1984]

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[andrew-kzoo]

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[jcbwlkr]

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[damienfa]

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