updated exception message to include types that were duplicated

Apparently Phil Jones had this error also, but if a type is duplicated when it shouldn't be then the exception:

> types: The same implementation type cannot be specificed multiple times

Is thrown, and it's impossible to know what the problem is. 

I updated the error to include the types:

![tinyioc](https://f.cloud.github.com/assets/895629/80849/14ecd33c-62b7-11e2-97f0-47eb476a2e30.png)

So it will show you all types that have been duplicated so you can fix them.