Add gocage destroy command, v0.35

CHANGELOG

@@ -1,3 +1,4 @@
 v.0.33b : Support jailing datasets on differents pools : jail_zfs_dataset now have to include the pool name  
 v.0.33c : Parallelize start/stop of jails with same priority  
 v.0.34 : jail name can be shortened 
+v.0.35 : One can now "gocage destroy"

README.md

@@ -132,6 +132,11 @@ To update jail patch version, use gocage update :
 `gocage update test`
 
 
+Delete jails  
+----------
+`gocage destroy test`
+
+
 Multi datastore  
 ----------
 A datastore is a ZFS dataset mounted. It should be declared in gocage.conf.yml, specifying its ZFS mountpoint :
@@ -214,6 +219,5 @@ TODO
 ----------
 gocage upgrade  
 gocage create  
-gocage destroy  
 gocage init  
   create default pool with defaults.json