Support Mincer 0.5.x and new option to pass in own Mincer object

With this ConnectMincer now supports Mincer 0.5.x, but loses the ability to support 0.4.x.

Pay close attention when you upgrade as you will also be moving to a new Mincer version which may (but shouldn't) have some unexpected results.

You can now also pass in your own Mincer object, if you want to require a different version of Mincer than the one which is bundled. This version must be >= 0.5.x though.