hive-tools update (user activity heatmap / market for dcity)

Today there are two updates for hive-tools.

1. a heatmap, that shows the activity of a given account for the last 7 days
   
2. more filter for the dCity market (SIM, SWAP.HIVE, DEC and animation) are added
   

Here are a few example heatmaps generated with the new tool:

Hive account@exodegame	Hive account@splinterlands	Hive account@dcitygame
Hive account@elindos	Hive account@yabapmatt	Hive account@gerber