phpDocumentor/phpDocumentor2 — pull request #1247 by mvriel (2014-05-09 13:07:08+00:00)
Title: #1211: Loading a single plugin is not possible

Due to a bug in Zend Config it is not possible to distinguish between
a single value and an array of values when using the same array keys.

There is a workaround for this bug by adding extra checks but this was
not added to the loading of plugins. This commit adds this workaround
so it becomes possible to load a single plugin.