changed syntax of :pom-plugins definition for pom task

1. support of [:configuration ... ] was removed
2. it was replaced with map which contains arbitrary XML definitions,
syntax is the same as in pom-additions

3. also added use case in pom-plugins

sample.project.clj

@@ -369,9 +369,15 @@
   ;; Extensions here will be propagated to the pom but not used by Leiningen.
   :extensions [[org.apache.maven.wagon/wagon-webdav "1.0-beta-2"]
                [foo/bar-baz "1.0"]]
-  ;; Plugins here will be propagated to the pom but not used by Leiningen.
+  ;; Plugins here will be propagated to the pom but not used by Leiningen.  
   :pom-plugins [[com.theoryinpractise/clojure-maven-plugin "1.3.13"
-                 [:configuration [:sourceDirectories [:sourceDirectory "src"]]]]
+               ;; this section is optional, values have the same syntax as pom-addition
+               {:configuration [:sourceDirectories [:sourceDirectory "src"]]
+                :extensions "true" 
+                :executions ([:execution [:id "echodir"] 
+                    [:goals ([:goal "run"])] 
+                    [:phase "verify"]])
+                }]
                 [org.apache.tomcat.maven/tomcat7-maven-plugin "2.1"]]
   ;; Include <scm> tag in generated pom.xml file. All key/value pairs
   ;; appear exactly as configured. If absent, Leiningen will try to

src/leiningen/pom.clj

@@ -237,14 +237,13 @@
         [:directory (:target-path project)]
         [:outputDirectory (:compile-path project)]
         [:plugins
-	        (if-let [plugins (seq (:pom-plugins project))]
-	                       (for [[dep version configuration] plugins]
-	                         [:plugin
-	                          [:groupId (or (namespace dep) (name dep))]
-	                          [:artifactId (name dep)]
-	                          [:version version]                           
-                            ;place for maven configuration tag    
-                            [:configuration configuration]
+            (if-let [plugins (seq (:pom-plugins project))]
+                           (for [[dep version plugin-addition] plugins]
+                             [:plugin
+                              [:groupId (or (namespace dep) (name dep))]
+                              [:artifactId (name dep)]
+                              [:version version]
+                              (if (map? plugin-addition) (seq plugin-addition))
                            ]                            
                           ))