Chain Query Builder: Compose MySQL queries chaining functions

This class can be used to compose MySQL queries chaining functions that define query parameters.

It can create and compose the SQL statement of a query by performing chained calls to different functions of the class that take parameters to define different values of the queries.

The class provides functions for defining the type of query (SELECT, INSERT, UPDATE and DELETE), involved fields and field values, condition clauses, result grouping and ordering, and the result set row range.

1.1
added JOIN, LEFT JOIN, RIGHT JOIN, USING, ON
added IN to the where method as a valid operand