Added ability to pull stats on a class

  Since going through the collection API is a bit awkward and the keys
  returned are camel-cased, this commit adds the ability to get these
  stats through ClassName.stats.snake_cased_field.
Fixed be_true -> be_truthy deprecation warning in specs
Fixed be_false -> be_falsey deprecation warning in specs

  Used the follwoing command to do this:
  $ grep -R be_false spec/ | awk -F: '{print $1}' | uniq | xargs sed -i 's/be_false/be_falsey/g'
Fixed other rspec depprectations (its)
Merge pull request #583 from sgnn7/add_collection_stats

Add collection stats and cleanup deprecation warnings