v3.1.0

Made a few major updates including:

• Restructured the interfaces that the PHPTester class uses to improve flexibility
• Fixed a very minor "bug" in the describe method regarding timing the script
• Rewrote the entire documentation
• Added a few examples to guide users as to how to use PHPTester properly
• Removed the miscellaneous get_execution_time method

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16/08/16 Update: Added class constant VERSION (see Documentation for full details)