return Collection of added plugins from PluginManager.addPluginsFrom (instead of void)

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Hi,

I am wondering if there is any particular reason why the return object of 
PluginManager.addPluginsFrom is currently 'void'?
It would be useful if PluginManager.addPluginsFrom returns a Collection of 
added Plugins so the programmer can store them for later internal use, or use 
them immediately. 

I am aware of PluginMangerUtils.getPlugins but sometimes there would be too 
much hassle to filter out an specific plugin from that list, especially when 
there are multiple implementations of a plugin interface.

I believe that the suggested change in the API will be non intrusive, because 
no change would be necessary in any existing code which uses this method.

Kind regards,

Original issue reported on code.google.com by shah...@gmail.com on 29 Aug 2011 at 9:02