Fixed a bug in the title output: Standard title was displayed even with a custom title set.

git-svn-id: https://plugins.svn.wordpress.org/multicolumn-category-widget/trunk@891346 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated installation description (the package name changes with each release).

git-svn-id: https://plugins.svn.wordpress.org/multicolumn-category-widget/trunk@891347 b8457f37-d9ea-0310-8a92-e5e31aec5664