Improve selectors to allow multiple heat maps on a  page
Add a wrapper for web workers.
Split out the heat map clustering into a web-worker

- Should make page more responsive for large number of genes
- Also better clustering by first choosing "most extreme" gene
Update colours in heat map, table and kegg image.

Red is "up", blue is "down"
Add a legend to the heatmap
Make heatmap always fc relative to row average
Improve show heatmap "thinking" while computing clustering
Merge branch 'master' into pca
Improve PCA option handling
Improve layout of axes on MDS plot
Disable the heat map when looking at the MDS plot
Remove dead code from PCA
Add method to set slider & text value
Add bar chart of MDS dimension magnitude to MDS plot
Update changelog