Moved inclusion of vis.js to just before close of body tag
.gitignore added kate swap file to ignore list. google-heatmap.html test page added to try google's heatmap visualisation library
google-vis.js implemented google heatmap using the UK heatmap data from davide
google-vis.js multiple radius changing values, MIN_BIN and MAX_BIN on URL
google-vis.js added RADIUS parameter to URL
google-vis.js added OPACITY control to URL
google-vis.js changeGradient cycles through a few different gradients
Added defineCentroids.js to main page for cenntroid data
Default layer is heatmap layer but centroid layer is defined