Provide context in error messages

[ryanbrandenburg]

As mentionaed in #53 there isn't enough context in error messages like this to make diagnosing issues easy. Let's see about piping through some information like what method was trying to be called.

[Eilon]

Is this doable in 1.1.0? Or postpone 'til later?

[rynowak]

We could probably wait for feedback on this one if it's hard. I just noticed it while debugging the #53 that error message isn't really helpful unless you know where to look already.

[Eilon]

Let's try to fix in 1.1.0, but if we can't, we can move it out.

[ryanbrandenburg]

This turned out to be faster than I thought due to using @rynowak's idea about nested exceptions. It's merged in now.