le.sh v2.0.0

1. Unix-like command api
2. 100% compatible with le.sh 1.x command api.
3. Support different webroot for each domain in the same cert.
```
le.sh  --issue  -d a.com  -w /wwwroot/a.com  -d b.com -w /wwwroot/b.com
```
4. Support different authentication methods for each domain in the same cert. Hybrid usage:
```
le.sh  --issue  -d a.com -w /wwwroot/a.com  -d  b.com -dns dns-cf
```

5. Two different debug levels to provide useful debug info. `--debug`  or `--debug 2`
6. Support to install `fullchain.cer` after renewal.
7. Better performance.

dnsapi/dns-cx.sh

@@ -194,7 +194,7 @@ _rest() {
     _err "error $ep"
     return 1
   fi
-  _debug response "$response"
+  _debug2 response "$response"
   if ! printf "$response" | grep '"message":"success"' > /dev/null ; then
     return 1
   fi
@@ -202,33 +202,3 @@ _rest() {
 }
 
 
-_debug() {
-
-  if [ -z "$DEBUG" ] ; then
-    return
-  fi
-  
-  if [ -z "$2" ] ; then
-    echo $1
-  else
-    echo "$1"="$2"
-  fi
-}
-
-_info() {
-  if [ -z "$2" ] ; then
-    echo "$1"
-  else
-    echo "$1"="$2"
-  fi
-}
-
-_err() {
-  if [ -z "$2" ] ; then
-    echo "$1" >&2
-  else
-    echo "$1"="$2" >&2
-  fi
-}
-
-