Fastest_CSV Crashes in Sidekiq

[jonmchan]

This might help others who decide to use fastest_csv with sidekiq. Known bug that alias_method (used in fastest_csv) will cause sidekiq to crash (sidekiq/sidekiq#2139). Best way around it when working inside a sidekiq worker is to avoid using FastestCSV#shift such as by:

 csv_file = File.open('your/csv/file/here.csv', 'rb')
 shift(csv_file) # manually handle it instead

 def shift csv_file
 if line = csv_file.gets
 line.parse_csv
 else
 nil
 end
 end