Misc layout and CSS tweaks

* Fix checkbox label alignment on top-aligned forms
* Fix Top Aligned label radio option not being checked when selected (admin)
* Add label layout option for sidebar forms
* CSS tweaks to improve field spacing and improve default sidebar layouts
* Restrain overly wide select fields in sidebar forms
* Beautify CSS formatting consistent

Signed-off-by: Nick Ciske <nick@thoughtrefinery.com>

git-svn-id: https://plugins.svn.wordpress.org/salesforce-wordpress-to-lead/trunk@1051837 b8457f37-d9ea-0310-8a92-e5e31aec5664