Flash and segmentation features added

[rotexdegba]

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• Moved exception methods into the new trait \Josantonius\Session\ExceptionThrowingMethodsTrait
• Added a new Exception (\Josantonius\Session\Exceptions\EmptySegmentNameException) used in the new Session Segment class (\Josantonius\Session\FlashableSessionSegment)
• Added a new Session Segment Class (\Josantonius\Session\FlashableSessionSegment) that stores data in a sub-array inside $_SESSION & provides data flashing functionality
• Added a new Interface (\Josantonius\Session\SessionInterface)
• Josantonius\Session\Session changes:
  • Now implements \Josantonius\Session\SessionInterface
  • start method now sets the session name before starting the session if the name option is specified
  • Exception throwing method have been moved to \Josantonius\Session\ExceptionThrowingMethodsTrait
  • Uses \Josantonius\Session\ExceptionThrowingMethodsTrait to make exception throwing methods available
• Added tests to test all features in \Josantonius\Session\FlashableSessionSegment
• Updated README.md with instructions on how to use \Josantonius\Session\FlashableSessionSegment