Add .table-extra-condensed

[miksh7]

It would be nice to have .table-extra-condensed with padding:2px for very compact tables.

In conjunction with #10987 it could be later named as .table-xs.

[zlatanvasovic]

Interesting.

[mdo]

Not going to happen, sorry.

[TomHart]

@mdo Just curious, how come?

[PaluMacil]

@TomHart I was confused about the lack of explanation from @mdo but believe it's because most things in Bootstrap are very large and spaced out, so it might clash too much with everything else. It's also fairly easy to make a css file with:

.table-xtra-condensed > thead > tr > th,
.table-xtra-condensed > tbody > tr > th,
.table-xtra-condensed > tfoot > tr > th,
.table-xtra-condensed > thead > tr > td,
.table-xtra-condensed > tbody > tr > td,
.table-xtra-condensed > tfoot > tr > td {
  padding: 2px;
}