Create TARGET.txt

This is my first draft of a Target table.  
It has several missing uniprot IDs.  They will need looking up by hand.  
I have left target_symbol and url null as I have been pushing to remove these. 
We do not have date created and created_by information so it is all the end of ENCODE2 30-SEP-2012.  
I also did not generate a target_no.