Refactor Package\Meta to Package\MetaData
The metadata for a package is organized in the "Meta" class, following the "MetaInterface". This means we also have "MetaReader" and various member variables named according to this schema.
Now, a meta reader reads about reading and what a meta interface is is greek to me. :)
Thus it seems to be a good thing to rename that "Meta" to "MetaData" and adjust the following uses of the name as well.