Update rsync_tmbackup.sh

Using find instead of ls to find the last and second last directory used for backup.
Update rsync_tmbackup.sh
Update rsync_tmbackup.sh

Using find with regex instead of glob
Update rsync_tmbackup.sh

Set LAST_TIME, LINE_CONUT and SECOND_LAST_TIME based on `uname -s` output for Mac OS compatibility.
Merge branch 'master' of https://github.com/rastkov/rsync-time-backup into rastkov-master

Conflicts:
	rsync_tmbackup.sh