Added

• Allow some few customization options for table borders and column alignment (#60)
  • For custom borders: adds classes border-<position>-<weight> for top, right, top, bottom and thin/thick respectively. Use with the borders-custom class.
  • For custom column alignment: adds classes col-<n>-l, col-<n>-c, col-<n>-r for n=1,...,12 and n being the n-th column of the table