Fixed the behavior of BCF2Utils.toList() when it's given an array
 * Old version return a List with a single element, which was the provided array.  This broke BCF writing, in particular when a FORMAT annotation used arrays instead of Lists
 * Made toList generic, rather than returning a List<Object>
 * Removed the redundant BCF2FieldEncoder.toList()
 * Added unit tests
Merge pull request #129 from pdexheimer/pd_bcf_attrib_arrays

Fixed the behavior of BCF2Utils.toList() when it's given an array