Instruct annex to add all CSV files to Annex

.gitattributes

@@ -1,4 +1,5 @@
 
 * annex.backend=MD5E
 **/.git* annex.largefiles=nothing
-* annex.largefiles=((mimeencoding=binary)and(largerthan=0))
+* annex.largefiles=((mimeencoding=binary)and(largerthan=0))
+*.csv annex.largefiles=anything