Rename zring to zhashring
Add equipotent zring class
Change ztimeout to use new zring class
Ignore backup files (*~)
Remove zhashlist_node_t type and dangerous zhashlist_goto method
Merge branch 'pull-gitignore-backup-files' into wip

Conflicts:
	.gitignore
Merge branch 'pull-zring' into wip
Update symbols file