Fix pom file deficiencies to fix warnings.

pom.xml

@@ -8,7 +8,7 @@
   <version>1.0.3</version>
   <packaging>jar</packaging>
   <name>speedbagit</name>
-  <url>http://maven.apache.org</url>
+  <url>https://github.com/DataONEorg/speed-bagit</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -64,6 +64,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.1</version>
         <configuration>
           <source>1.8</source>
           <target>${compiler.target.version}</target>
@@ -73,6 +74,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
         <configuration>
           <archive>
             <manifestEntries>
@@ -108,6 +110,7 @@
       </plugin>
       <plugin>
         <artifactId>maven-clean-plugin</artifactId>
+        <version>2.5</version>
         <configuration>
           <excludeDefaultDirectories>true</excludeDefaultDirectories>
           <filesets>
@@ -140,7 +143,7 @@
             </goals>
             <phase>deploy</phase>
             <configuration>
-              <url>${url}</url>
+              <url>${project.url}</url>
               <groupId>${project.groupId}</groupId>
               <artifactId>${project.artifactId}</artifactId>
               <file>${project.build.directory}/${project.build.finalName}.jar</file>
@@ -219,7 +222,7 @@
       <uniqueVersion>false</uniqueVersion>
       <id>jenkins.dataone.org</id>
       <name>DataONE</name>
-      <url>${url}</url>
+      <url>${project.url}</url>
       <layout>default</layout>
     </repository>
   </distributionManagement>