Adding Horizon Dashboard
Adding Horizon Dashboard

Contains optional (commented out) section to show only reviews the
user has not reviewed. This could be functionality added to the main
generator, but it's cleaner without the extra logic.

Change-Id: I2f94a0021f494b43c6a7f6d3e1249c6beb90a054

Frostman/gerrit-dash-creator,Frostman/gerrit-dash-creator,stackforge/gerrit-dash-creator,Frostman/gerrit-dash-creator