I opened a few pull requests last week that I'd like some eyes on.

In particular, these PRs:

Fixing a memory leak in the volume renderer, this involves some low-level cython changes to the volume rendering machinery:

Fixing an issue with "seams" in deeply nested AMR datasets:

Remove some unused C code:

Update YTArray to support some new features in the upcoming Numpy 1.13 release:

Thanks for your help!

-Nathan