Do not group "minor" slices into "Others"
New methods / documents to automatically display stats about gene-trees
Code to draw a tree

The drawing is made inside of a HTML table. Each branch / node is
assigned to a cell of the grid. The code assumes that several images are
available under the same URL (ct_hor.png, etc)
The gene-tree statstics are split in several pages
Merge pull request #21 from muffato/feature/gene_tree_stats

Feature/gene tree stats. Merge to master, double check changes.