Pad range with zeroes

  In most environments the ranges are padded with zeroes.

  This only pads with leading zeroes when both A and B have the same lenght.

  {1..16} will expand to 1 - 16
  {001..016} will expand to 001 - 016
Added tests for padding zeroes in range
fixed redefinition
Merge pull request #3 from dmeulen/dbl_addPaddedRange

Pad range with zeroes