Fix build and tests

[beatgammit]

I removed a bunch of lifetimes (unnecessary?) and used std::thread::Builder instead of std::thread::Thread to get information about panics from the thread.

There's still a bunch of compile warnings, but this at least cleans up the errors.

[lilyball]

The lifetimes are absolutely necessary. They're what keeps you from converting a LuaState to an ExternState and having it outlive the original LuaState. This code just needs to be converted to use a PhantomData marker.

I already have the conversion done locally, but I'm waiting for rust-lang/rust#22749 (since I also converted the build script to use std::process and it's currently broken).

[beatgammit]

The lifetimes are absolutely necessary... This code just needs to be converted to use a PhantomData marker.

Ok, that makes sense. I wasn't 100% sure about removing the lifetimes because of all of the unsafe transmute blocks. Good to know you're already on it!

but I'm waiting for rust-lang/rust#22749

Awesome, that was quick!

[lilyball]

I just pushed my changes. Turns out that if I don't set stdout/stderr at all, it will default to inherit, so I don't actually have to wait for rust-lang/rust#22749.