New in this version:

• Deterministic renders. If you render an image twice with the same settings, the resulting image will match perfectly.
• Rendertime estimates are now computed on the main thread. Much more reliable, no more race conditions.
• Improved render status now shows completion percentage, average microseconds per ray, estimate until finished and samples per second. This status updates ~4 times a second.
• All memory leaks are fixed as of this release.
• Heaps of internal refactoring to ease future development.
• Added support for loading textures from the following formats: JPEG, BMP, TGA, PIC and PNM (f7106e1)
• Dramatically reduce KD-tree construction time. It no longer has an O(n^2) end condition (cb59980)
• Write render information to PNG tEXt chunks. (You can observe with imagemagic: identify -verbose output/rendered_0000.png)
• Timers now use microsecond precision.
• Start implementing a new public API in src/c-ray.h. This is still very much WIP, but it is starting to look pretty good.
• Fix over a hundred warnings, we now build with -Wextra where applicable.
• Reduce heap allocations where they were not needed.