Prepare POM for sonatype deployment

Author: kayahr

pom.xml

@@ -66,7 +66,6 @@
     <connection>scm:git:git://github.com/usb4java/${project.artifactId}.git</connection>
     <developerConnection>scm:git:ssh://git@github.com/usb4java/${project.artifactId}.git</developerConnection>
     <url>http://github.com/usb4java/${project.artifactId}</url>
-    <tag>HEAD</tag>
   </scm>
 
   <issueManagement>
@@ -216,14 +215,67 @@
         <artifactId>maven-resources-plugin</artifactId>
         <version>3.1.0</version>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+        <version>3.0.1</version>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-javadoc-plugin</artifactId>
+        <version>3.0.1</version>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-release-plugin</artifactId>
+        <version>2.5.3</version>
+      </plugin>
     </plugins>
   </build>
 
+  <profiles>
+    <profile>
+      <id>release-sign-artifacts</id>
+      <activation>
+        <property>
+          <name>performRelease</name>
+          <value>true</value>
+        </property>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-gpg-plugin</artifactId>
+            <version>1.6</version>
+            <executions>
+              <execution>
+                <id>sign-artifacts</id>
+                <phase>verify</phase>
+                <goals>
+                  <goal>sign</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+
   <repositories>
+    <repository>
+      <id>sonatype-releases</id>
+      <name>Sonatype Snapshot Repository</name>
+      <url>https://oss.sonatype.org/content/repositories/releases</url>
+      <releases><enabled>true</enabled></releases>
+      <snapshots><enabled>false</enabled></snapshots>
+    </repository>
     <repository>
       <id>sonatype-snapshots</id>
       <name>Sonatype Snapshot Repository</name>
       <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+      <releases><enabled>false</enabled></releases>
       <snapshots><enabled>true</enabled></snapshots>
     </repository>
   </repositories>
@@ -271,7 +323,7 @@
     <dependency>
       <groupId>org.usb4java</groupId>
       <artifactId>usb4java</artifactId>
-      <version>1.3.0-SNAPSHOT</version>
+      <version>1.3.0</version>
     </dependency>
   </dependencies>