Adds an add_template() method to the Plugin class which allows plugins to easily add new named templates from directories outside of the active theme directory.  For example, this would allow a plugin to define a new template named 'foo' that exists in the plugin directory itself as foo.php.
Adds an add_template() method to the Plugin class which allows plugins to easily add new named templates from directories outside of the active theme directory.  For example, this would allow a plugin to define a new template named 'foo' that exists in the plugin directory itself as foo.php.

git-svn-id: d0e296eae3c99886147898d36662a67893ae90b2@1297 653ae4dd-d31e-0410-96ef-6bf7bf53c507

dragonmantank/Habari,dragonmantank/Habari,dragonmantank/Habari