* Added "In Plugin Update Message" function to display relevant `changelog` entries
* Added class `bns-smf-feeds-content` wrapper for widget output
* Changed to a "Singleton" instantiation method
* Improved code formatting to better meet WordPress Code Standards
* Optimized `esc_attr( __() )` to `esc_attr__()`
* Updated inline documentation
* Updated "Tested up to" version to 4.1
* Updated "Requires at least" version to 3.6 (for shortcode filter option)

git-svn-id: https://plugins.svn.wordpress.org/bns-smf-feeds/trunk@1051072 b8457f37-d9ea-0310-8a92-e5e31aec5664