Added height rules for table row, mostly for removing the added space after a table
- Code mostly come from this discussion: https://phpword.codeplex.com/discussions/440933
- Adapted and works for 0.8.1
- Usage: $table->addRow(5000, $rowStyle, "exact");

Signed-off-by: Julien Carignan <julien.carignan@hotmail.com>