Support for rustc nightly 2014-06-29

[samyatchmenoff]

• Changed * to *const
• Changed enum repr to i32 to fix type mismatch errors
• Also an unrelated change that fixes Source::unqueue_buffer and Source::unqueue_buffers so they handle errors and return results instead of filling buffers

[samyatchmenoff]

Actually I'm having seconds thoughts about trying to handle errors like that. I think the library should either check and report errors universally or shouldn't do it at all. Opinions?

[samyatchmenoff]

I've gone ahead and removed the error handling until a deliberate decision is made about it.

[brendanzab]

Ack, sorry for the late reply. Yeah, this is awesome! Thanks for your great work! As my last request, could you squash the last three commits into one?

[samyatchmenoff]

I assume you mean all the commits since the last pull request which is actually 5 commits. They are all squashed now.

I'll keep the pull requests cleaner from now on.

[brendanzab]

👍 - sorry for all the bother, thanks so much for your contribution! ^_^