fixes jangaroo-libs part of JOO-86
"Allow EXML plugins to access their hosting component"
http://jangaroo.myjetbrains.com/youtrack/issue/JOO-86

Implement class ext.config.plugin, which is now the default to inherit
from when no explicit super class is given in an EXML plugin.
This class provides the "component" config option.
fixes LIBS-64
"Component#getState() and #applyState() missing in Ext AS API"
http://jangaroo.myjetbrains.com/youtrack/issue/LIBS-64