Minor adjustments to closure compiler pom

- remove duplicate definitions
- set explicit versions for build reproducibility
- switch to ssh github for easier build/release process
- set minimum required maven version
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=70359996

Author: blickly

pom.xml

@@ -36,12 +36,16 @@
   </description>
   <inceptionYear>2009</inceptionYear>
 
+  <prerequisites>
+    <maven>2.2.1</maven>
+  </prerequisites>
+
   <scm>
     <connection>
       scm:git:https://github.com/google/closure-compiler.git
     </connection>
     <developerConnection>
-      scm:git:https://github.com/google/closure-compiler.git
+      scm:git:git@github.com:google/closure-compiler.git
     </developerConnection>
     <url>
       https://github.com/google/closure-compiler
@@ -108,7 +112,6 @@
   </developers>
 
   <properties>
-    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.build.outputEncoding>UTF-8</project.build.outputEncoding>
     <jdk.version>1.7</jdk.version>
@@ -120,6 +123,11 @@
     <pluginManagement>
       <!-- set versions/conf of common plugins for reproducibility, ordered alphabetically by owner -->
       <plugins>
+        <plugin>
+          <groupId>org.apache.felix</groupId>
+          <artifactId>maven-bundle-plugin</artifactId>
+          <version>2.4.0</version>
+        </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-antrun-plugin</artifactId>
@@ -151,12 +159,12 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-surefire-plugin</artifactId>
-          <version>2.16</version>
+          <version>2.17</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-shade-plugin</artifactId>
-          <version>2.2</version>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>2.4</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>