Changed masthead h4 to p

Used to have an h4 tag with class of site-description for the subhead.
Changed to a p tag with class of lead, to be more in line with
Bootstrap convention.
Eliminate class=page-header

Using the class=page-header should occur only in header.php, if at all.
Putting it in the live area files results in the odd formatting of a
rule below the content heading text. Removing this class from the live
area files is more in line with Bootstrap convention, IMO.
Fluid layout option

Alert the themer to the possibility of creating a more fluid layout by
using the container-fluid and row-fluid classes instead of the default
container and row classes.
Correction of the last commit

There IS a container-fluid in Bootstrap 3, but no row-fluid. Sorry
Merge pull request #39 from greg-raven/master

Suggestions for formatting changes