Improve Map

[jmank88]

#23 restored the map. There is still room for improvement.

• The locations derived from the IPs are not completely accurate. Since the node list is fairly static, we should consider overriding these manually with more accurate coordinates. (Perhaps by extending the existing 'trusted' list code which we are not currently using, or adding a --netstatsgeo=12.3,45.6 flag to the nodes) trusted locations #32

• When multiple nodes are stacked on the map, only the top one is visible and prevents hovering over the others, completely hiding them. We should consolidate overlapping/stacked nodes into one and list them all in the one tooltip.

• Display signers and non-signers differently (colors?)

• Color countries with nodes

[jmank88]

1 is fixed by #32