[Fix #49] Add new Rails/RescueFromExceptionsVariableName cop
          #1440
        
          
      
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Fixes #49
Based on #139
Ensures that rescued exception variables are named as expected.
The
PreferredNameconfig option specifies the required name of the variable.Its default is
e, as referenced fromNaming/RescuedExceptionsVariableName.Before submitting the PR make sure the following are checked:
[Fix #issue-number](if the related issue exists).master(if not - rebase it).bundle exec rake default. It executes all tests and runs RuboCop on its own code.{change_type}_{change_description}.mdif the new code introduces user-observable changes. See changelog entry format for details.