#1369: Rename tag followed by delete tag yielded an assert.  Map of names -> Tags was kept but did not monitor  renames, hence the problem.
#1369: Rename tag followed by delete tag yielded an assert.  Map of names -> Tags was kept but did not monitor 
renames, hence the problem.


jof/shotwell,Sanva/shotwell-gsoc,ritchiewilson/shotwell,polymeris/shotwell,ritchiewilson/shotwell,h4ck3rm1k3/shotwell,damianmoore/shotwell,jof/shotwell,Sanva/shotwell-gsoc,h4ck3rm1k3/shotwell,jof/shotwell,jimbonator/shotwell,ritchiewilson/shotwell,Sanva/shotwell-gsoc,abrauchli/shotwell,jimbonator/shotwell,damianmoore/shotwell,damianmoore/shotwell,jimbonator/shotwell,h4ck3rm1k3/shotwell,abrauchli/shotwell,polymeris/shotwell,abrauchli/shotwell,polymeris/shotwell