Commits on Nov 2, 2015

1. Use class inst. var. instead of class var. …

   I use the term "class instance variable" and "class variable"
   even though `PaperTrail` is a module. This nomenclature is
   conventional in ruby.
   
   > module A; @@x = :x; puts defined?(@@x); end
   > #=> "class variable"
   
   Actually, because `PaperTrail` is a module, the use of a class
   variable here is not as problematic as in an actual class, so
   this change is solely to conform the the Ruby Style Guide.
   
   > Avoid the usage of class (@@) variables due to their "nasty"
   > behavior in inheritance.
   > https://github.com/bbatsov/ruby-style-guide#no-class-vars
   
   As stated above, because `PaperTrail` is a module, there is no
   concern over inheritance, and this change is solely to conform
   to the style guide.

   

   jaredbeck committed Nov 2, 2015
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