Added ACF object to object properties.
Fixed build__meta() function -- it only needs the value, not the key and value.
Made changes to cleanMeta()

These changes more accuratly clean metadata after it is retrieved from
WordPress. When metadata is retrieved from WordPress in arrays because
each metakey can have multiple rows in the database.

Changes to cleanMeta() check to see if there is only one value in
each key's array. If there is, there is no need for it to still be
in an array, so we shift it out.

Additionally, if a value is saved to the database as a serialized array,
it comes out a serialzed array.
No longer have to extract meta out of an array since we're going that in the Query object now.
Meta can be a series of multidimensional arrays, so I updated falsePositives()
to look through all levels, not just the first.