New features ready for v1

This release is intended to be feature complete, ready for v1, but as it hasn't been actively used in any real-world project, the v1 release is going to wait.

New features:

• Indexed & named parameter helpers - if you are referencing a field that has the same name as an injected parameter, or the injected parameter is done by index, you can use the :fieldName and ?fieldName helper syntax to remove duplication.
• OOP improved greatly, abstract classes are more meaningful for example, delete from tablename - a delete query can't not have a from table, so now neither can the abstract delete class.
• insert...select and replace...select queries are now fully implemented.