Crystal heatmap now has range parameter.
Specifies the number of integer crystals around the center to add to the plot, default 10 (i.e. -10 through +10)
Complete rewrite of L1EGammaCrystalsProducerTest
Also, tweaked crystal heatmap code to resemble the producer.
Producer rewrite bugfixes
1. foreach needs to reference not copy construct!
2. edm::Producer::beginRun() never gets called?!