less specific default alignment for table cells

Created by: trumbitta

table th, table td is giving me unsolicited headaches and less love than I deserve when it comes to customize the alignment of some cells in my tables via small utility classes like

<table class="table">
...
  <td>hey an item</td>
  <td class="text-center"><img src="myEditIcon" /></td>
...
</table>

...
text-center {
  text-align: center;
}
...

So, I moved the default text-align for table cells outside the .table selector. This way, I have both the default alignment and the power to easily override it only where I need to.