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PHP-1056: Limit legacy projection argument handling to numeric arrays

The "field names must be strings" exception was intended for the legacy argument style (i.e. array of field names to include). One could argue that the original code should simply have cast array values to strings for convenience, but we definitely don't need this processing for associative arrays. This does leave an edge case where the associative array is indistinguishable from a numeric array, which we cover in the included tests.
Merge pull request #665
Fixed PHP-1059: updatedExisting always true

The updatedExisting field should always be set - but only when upserted is not set and n > 1 it is true
Merge pull request #666 from bjori/update-existing

Fixed PHP-1059: updatedExisting always true

* bjori/update-existing:
  Fixed PHP-1059: updatedExisting always true
Fix zts build on PHP5.6 :]