containerize footer
containerize carousel
hide homepage sidebar if empty
navbar: use built-in bootstrap classes for top/bottom/static positioning

Use the bootstrap classes for navbar-fixed-top, etc. to position the
top navigation. Add option for fixed-bottom navbar positioning.
add footer options

custom footer text and checkbox for footer nav menu
Merge remote-tracking branch 'origin/containerize' into kennedyr-merge

Conflicts:
	functions.php

merge containerize branch
+use containers for the footer and carousel
+hide homepage sidebar if it's empty
+use bootstrap classes for navbar positioning
+add options for footer custom text