Update layout of expanded details content; fixes #192

[cbeer]

Fixes #192

Before:

After:

[mejackreed]

Looks good and makes the requested layout changes. However, I wonder if we should just make the column counts equal 12. The offsets are calculating appropriately but it feels like it may not need ancillary additional classes?

col-md-11 offset-md-2 = 13 cols

col-md-2 offset-md-2 + col-8 = 13 cols

Is there a reason @jvine that we need to go to 13 columns here?

[cbeer]

(I'm going to regret not pulling out helper methods for these, I guess..)

[jvine]

Damn. Yes, my typo. This is correct: <div class="col-11 offset-1 col-md-10 offset-md-2">

But I don't understand this comment:

col-md-2 offset-md-2 + col-8 = 13 cols

<dt class="col-3 offset-1 col-md-2 offset-md-2">
<dd class="col-8">

3 + 1 + 8 = 12, and 2 + 2 + 8 = 12