Fix wrong tagnames in exceptions.

diff --git a/grails-app/taglib/JsecTagLib.groovy b/grails-app/taglib/JsecTagLib.groovy
--- a/grails-app/taglib/JsecTagLib.groovy
+++ b/grails-app/taglib/JsecTagLib.groovy
@@ -130,7 +130,7 @@
      */
     def hasRole = { attrs, body ->
         // Does the user have the required role?
-        if (checkRole(attrs)) {
+        if (checkRole(attrs, 'hasRole')) {
             // Output the body text.
             out << body()
         }
@@ -142,7 +142,7 @@
      */
     def lacksRole = { attrs, body ->
         // Does the user have the required role?
-        if (!checkRole(attrs)) {
+        if (!checkRole(attrs, 'lacksRole')) {
             // Output the body text.
             out << body()
         }
@@ -213,7 +213,7 @@
      * has the given permission.
      */
     def hasPermission = { attrs, body ->
-        if (checkPermission(attrs)) {
+        if (checkPermission(attrs, 'hasPermission')) {
             // Output the body text.
             out << body()
         }
@@ -224,7 +224,7 @@
      * does not have the given permission.
      */
     def lacksPermission = { attrs, body ->
-        if (!checkPermission(attrs)) {
+        if (!checkPermission(attrs, 'lacksPermission')) {
             // Output the body text.
             out << body()
         }
@@ -245,7 +245,7 @@
      * given tag attributes. Returns <code>true</code> if the user
      * has the role, otherwise <code>false</code>.
      */
-    private boolean checkRole(attrs) {
+    private boolean checkRole(attrs, tagname) {
         // Extract the name of the role from the attributes.
         def roleName = attrs['name']
         def inList = attrs['in']
@@ -259,7 +259,7 @@
             return results.any()
         }
         else {
-            throwTagError('Tag [hasRole] must have one of [name] or [in] attributes.')
+            throwTagError('Tag [${tagname}] must have one of [name] or [in] attributes.')
         }
     }
 
@@ -268,7 +268,7 @@
      * the given tag attributes. Returns <code>true</code> if the user
      * has the permission, otherwise <code>false</code>.
      */
-    private boolean checkPermission(attrs) {
+    private boolean checkPermission(attrs, tagname) {
         def permission
         def permClass = attrs['type']
         if (!permClass) {
@@ -277,7 +277,7 @@
             permission = attrs['permission']
 
             if (!permission) {
-                throwTagError('Tag [hasPermission] must have either a [type] attribute or a [permission] one.')
+                throwTagError("Tag [${tagname}] must have either a [type] attribute or a [permission] one.")
             }
 
             if (!(permission instanceof org.jsecurity.authz.Permission)) {
@@ -289,7 +289,7 @@
             // 'target' defaults to '*'.
             def actions = attrs['actions']
             if (!actions) {
-                throwTagError('Tag [hasPermission] must have an [actions] attribute if [type] is used.')
+                throwTagError('Tag [${tagname}] must have an [actions] attribute if [type] is used.')
             }
 
             def target = attrs['target']
@@ -302,7 +302,7 @@
                 permission = constructor.newInstance([ target, actions ] as Object[])
             }
             catch (ClassNotFoundException ex) {
-                throwTagError("Cannot find class [${permClass}] from attribute [hasPermission].")
+                throwTagError("Cannot find class [${permClass}] from attribute [permission] in tag [${tagname}].")
             }
         }