added support for arbitrarily many types in multi mapping
Merge remote-tracking branch 'upstream/master' into arbitrary-multi-maps

Conflicts:
	Dapper NET45/SqlMapperAsync.cs
fix up the arbitrary length multi map methods with new command.AddToCache parameter
Merge remote-tracking branch 'upstream/master' into arbitrary-multi-maps

Conflicts:
	Dapper NET45/SqlMapperAsync.cs
Merge branch 'arbitrary-multi-maps' of https://github.com/Polylytics/dapper-dot-net into Polylytics-arbitrary-multi-maps

Apply recent changes (output callbacks)

Conflicts:
	Dapper NET45/SqlMapperAsync.cs
Merge branch 'Polylytics-arbitrary-multi-maps'
Merge branch 'master' of github.com:StackExchange/dapper-dot-net