Changed rez-release-git to always use temp file for tag messages: in some cases, with very long changelogs, the tag message can become too long to be passed on the command line. Also added the -a flag to the tag command (although this is implied if -F or -m is used).
Changed rez-release-git to always use temp file for tag messages: in some cases, with very long changelogs, the tag message can become too long to be passed on the command line. Also added the -a flag to the tag command (although this is implied if -F or -m is used).

nerdvegas/rez,instinct-vfx/rez,instinct-vfx/rez,nerdvegas/rez