code: function partition(array, partitionSize) {
      partitionSize = partitionSize || array.length;
      var ret = [];
      for (var i = 0, l = array.length; i < l; i += partitionSize) {
          ret.push(array.slice(i, i + partitionSize));
      }
      return ret;
  }
docs: Paritition an array.
  
  ```
  var arr = [1,2,3,4,5];
  
  comb.array.partition(arr, 1); //[[1], [2], [3], [4], [5]]
  comb.array.partition(arr, 2); //[[1,2], [3,4], [5]]
  comb.array.partition(arr, 3); //[[1,2,3], [4,5]]
  
  comb.array.partition(arr); //[[1, 2, 3, 4, 5]]
  comb.array.partition(arr, 0); //[[1, 2, 3, 4, 5]]
  
  
  
  ```
  
  @param array
  @param partitionSize
  @returns {Array}
  
  @static
  @memberOf comb.array