Vikram Menon/vikmenon (UFID: 31935985)

Latest code for Hue Histogram filter. Currently deals well with
brightness/darkness changes but not saturation level changes etc.

NOTE: Algorithm is very broken:
1. Needs to be parallelized
2. Stop recomputing each histogram per function call
3. Use order of keyframes to reduce number of comparisons
4. Map out similar histograms to reduce number of comparisons on a query