Created Test for Batching

In Parallel::ForkManager::Batch
  Added usage of strict and warnings and fixed bugs/errors/warnings
  generated.

In t/01-standard_batch.t
  Added tests for use cases:
    One Record Batch
    Enough Records Only For 1 Proc
    Enough Records Only for Half the Procs
    Exact Match - One Round
    One and a Half Rounds
    Three Rounds