Partially fixed GROUP_TO_GROUP Tally
Removed memory bug in Region.cpp
Removed memory bug in Material.cpp
Added _num_edges to fix the fact that with a GROUP_TO_GROUP tally, _num_bins+1 != _num_edges
Fixed GROUP_TO_GROUP_RATE Tally output
Made Region.cpp consistent with Material.cpp again
Fixed documentation for getNumEdges()
Merge pull request #73 from cjosey/master

Patch for GROUP_TO_GROUP_RATE Tally