code: function rotate (a, direction, amount) {
                      if(!(a instanceof Array)) return a;
                      if(direction && libs.object.isNumeric(direction) && !amount) {
                          amount    = direction;
                          direction = undefined;
                      }
  
                      if(!amount || (amount && !libs.object.isNumeric(amount))) amount = 1;
                      for(var i = 0; i < amount; i++) {
                          if(direction !== 'right') a.push(a.shift()); else a.unshift(a.pop());
                      }
                      return a;
                  }
docs: Rotates the array left or right the specified number of times. If the direction is left, it will shift off the
  first <em>n</em> elements and push them to the end of the array. If right, it will pop off the last <em>n</em>
  items and unshift them onto the front of the array.
  @param {Array} a The Array object to operate on.
  @param {String=} [direction='left'] The direction to rotate array members.
  @param {Number=} [amount=1] The number of elements to shift
  @return {Array<*>} The current array, shifted.
  @function