Prepend S3Proxy version in User-Agent header

This only includes the version in the main package and not the unit
test.  Fixes #136.

pom.xml

@@ -119,6 +119,18 @@
           </dependency>
         </dependencies>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <configuration>
+          <archive>
+            <manifest>
+              <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
+              <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
+            </manifest>
+          </archive>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>

src/main/java/org/gaul/s3proxy/Main.java

@@ -34,6 +34,7 @@ import com.google.inject.Module;
 
 import org.jclouds.Constants;
 import org.jclouds.ContextBuilder;
+import org.jclouds.JcloudsVersion;
 import org.jclouds.blobstore.BlobStore;
 import org.jclouds.blobstore.BlobStoreContext;
 import org.jclouds.location.reference.LocationConstants;
@@ -251,6 +252,12 @@ public final class Main {
                     Constants.PROPERTY_CREDENTIAL + "\n");
         }
 
+        properties.setProperty(Constants.PROPERTY_USER_AGENT,
+                String.format("s3proxy/%s jclouds/%s java/%s",
+                        Main.class.getPackage().getImplementationVersion(),
+                        JcloudsVersion.get(),
+                        System.getProperty("java.version")));
+
         ContextBuilder builder = ContextBuilder
                 .newBuilder(provider)
                 .credentials(identity, credential)

src/test/java/org/gaul/s3proxy/TestUtils.java

@@ -35,6 +35,7 @@ import org.eclipse.jetty.util.component.AbstractLifeCycle;
 
 import org.jclouds.Constants;
 import org.jclouds.ContextBuilder;
+import org.jclouds.JcloudsVersion;
 import org.jclouds.blobstore.BlobStore;
 import org.jclouds.blobstore.BlobStoreContext;
 import org.jclouds.logging.slf4j.config.SLF4JLoggingModule;
@@ -184,6 +185,12 @@ final class TestUtils {
         String virtualHost = info.getProperties().getProperty(
                 S3ProxyConstants.PROPERTY_VIRTUAL_HOST);
 
+        info.getProperties().setProperty(Constants.PROPERTY_USER_AGENT,
+                String.format("s3proxy/%s jclouds/%s java/%s",
+                        TestUtils.class.getPackage().getImplementationVersion(),
+                        JcloudsVersion.get(),
+                        System.getProperty("java.version")));
+
         ContextBuilder builder = ContextBuilder
                 .newBuilder(provider)
                 .credentials(identity, credential)