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Added empty HeatmapsDemoActivity.
added QuadTree interface, LinearQuadTree implementation
Set up LinearQuadTree stub
Set up LinearQuadTree stub
LinearQuadTree fields created
Added convolution to HeatmapsUtil, with rudimimentary "tests" using logs, and a simple unit test,
Wrote getLocation method
Added tests for HeatmapsUtil (for kernel generation, and convolution)
wrote add method
Wrote remove method
Used binary search from Collections
Wrote search method
changed to base 4
Added quad enum, made remove binary search
Wrote interpolateColor
Renamed HeatmapsUtil to HeatmapUtil, and added some constants
Added generateColorMap (yet untested) and changed format of DEFAULT_HEATMAP_GRADIENT