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Basic implementation of SQL JOINs

Next\DB\Query\Builder
- Added an accessor to the built query

Next\DB\Query\Query
- Added three common constants for JOIN Clauses

Next\DB\Query\Renderer\Renderer
- Added interface method to render the JOIN Clauses

Next\DB\Query\Renderer\MySQL
- Implemented the new method of the above interface

Next\DB\Table\Select
- Added a method to build the JOIN Clauses
Merge branch 'join' into dev