Pineapple 0.3.0-RC1

This is the first release candidate for 0.3.0.

Changes are:

• Immense amount of refactoring, rescoping variables as private, ensure PSR-2 cleanliness
• Fix lots of suggestions as made by phpmd/phpcs/CodeClimate
• Introduce PDO driver
• Abstract common functionality between Doctrine DBAL and PDO and move into a trait
• Statement handles moved into StatementContainers, and used to abstract code further for sharing
• Fix some fundamental bugs produced by 0.2.0
• Produce some exceptions for cases that constitute misuse/internal faults and should cause fatals in calling code if uncaught
• Drop the connect method, DSN requirement and drop a large volume of unused code

This is a significant release over 0.2.0, and brings about a high level of suitability for production use.