Possible fix for sliding window bounds bug
Merge branch 'master' into sliding_window_bounds_bug
Slight simplification of addressing math in interpolate.
Removed debug printfs from SlidingWindow
Made static tests depend on HalideRuntime.h in Makefile
Turn off sliding for reductions.
Sliding reductions now substantially more correct.

Previously new pure values were clobbering old update values.
gitignore updates