Add new class .space for adding horisontal space.

Created by: Serhioromano

When you markup a page, especialy a column it is ver often when you need to add a little space between to <div>. And you want this space be equal everywhere for everything looks aligned.

Right now I use <br /> or simple add additional classes and add CSS instruction. But that would be nice to have horizontal spacer with would add the same space as we have width between span1-12.

This PR adds new class called .space. This class adds horizontal space equal to vertical space between span1-12

Here is the example of the usage.

<div class="container">
    <div class="row">
        <div class="span6">
            <div class="pull-right"><a class="btn">22</a></div>
            <div class="clearfix space"></div>
            <p>Col 1</p>
        </div>
        <div class="span6">Col 2</div>
    </div>
    <div class="space"></div>
    <div class="row space">Row 2</div>
    <div>Something</div>
</div>