Make SOUR references work like GEDCOM 5.5 says they should

This pull request should make the SourRef parser conform to the [source citation documentation](http://homepages.rootsweb.ancestry.com/~pmcbride/gedcom/55gcch2.htm#SOURCE_CITATION) here. 

Cases where a source is a reference are now handled differently than inline sources. In addition, OBJE support was absent from from SourRef while the spec says it should be supported. 

This would also close issue #15. In the case of #15, the SOUR is detected as a reference and the CONC tags are sent to logUnhandledRecord.