Use maven-assembly-plugin instead of Maven Shade

This works around MSHADE-183 which prevents use with Maven 3.2.5 and
has caused recent Travis CI failures.  Fixes #38.

pom.xml

@@ -120,50 +120,25 @@
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-shade-plugin</artifactId>
-        <version>2.3</version>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <version>2.5.3</version>
         <configuration>
-          <createDependencyReducedPom>false</createDependencyReducedPom>
-          <filters>
-            <filter>
-              <artifact>*:*</artifact>
-              <excludes>
-                <exclude>META-INF/*.SF</exclude>
-                <exclude>META-INF/*.DSA</exclude>
-                <exclude>META-INF/*.RSA</exclude>
-                <exclude>about.html</exclude>
-              </excludes>
-            </filter>
-          </filters>
-          <shadedArtifactAttached>true</shadedArtifactAttached>
-          <transformers>
-            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-              <manifestEntries>
-                <Main-Class>org.gaul.s3proxy.S3Proxy</Main-Class>
-                <Implementation-Build>${buildNumber}</Implementation-Build>
-                <Implementation-Version>${project.version}</Implementation-Version>
-                <Build-Date>${timestamp}</Build-Date>
-              </manifestEntries>
-            </transformer>
-            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
-            <transformer implementation="org.apache.maven.plugins.shade.resource.ApacheLicenseResourceTransformer"/>
-            <transformer implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer"/>
-            <transformer implementation="org.apache.maven.plugins.shade.resource.IncludeResourceTransformer">
-              <resource>logback.xml</resource>
-              <file>src/main/config/logback.xml</file>
-            </transformer>
-          </transformers>
+          <descriptors>
+            <descriptor>src/main/assembly/jar-with-dependencies.xml</descriptor>
+          </descriptors>
+          <archive>
+            <manifest>
+              <mainClass>org.gaul.s3proxy.S3Proxy</mainClass>
+            </manifest>
+          </archive>
         </configuration>
         <executions>
           <execution>
-            <id>jar-with-dependencies</id>
+            <id>make-assembly</id>
             <phase>package</phase>
             <goals>
-              <goal>shade</goal>
+              <goal>single</goal>
             </goals>
-            <configuration>
-              <shadedClassifierName>jar-with-dependencies</shadedClassifierName>
-            </configuration>
           </execution>
         </executions>
       </plugin>

src/main/assembly/jar-with-dependencies.xml

@@ -0,0 +1,32 @@
+<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
+  <id>jar-with-dependencies</id>
+  <formats>
+    <format>jar</format>
+  </formats>
+  <includeBaseDirectory>false</includeBaseDirectory>
+  <containerDescriptorHandlers>
+    <containerDescriptorHandler>
+      <handlerName>metaInf-services</handlerName>
+    </containerDescriptorHandler>
+  </containerDescriptorHandlers>
+  <dependencySets>
+    <dependencySet>
+      <outputDirectory>/</outputDirectory>
+      <useProjectArtifact>true</useProjectArtifact>
+      <unpack>true</unpack>
+      <scope>runtime</scope>
+    </dependencySet>
+  </dependencySets>
+  <fileSets>
+    <fileSet>
+      <directory>${project.basedir}/src/main/config</directory>
+      <outputDirectory>/</outputDirectory>
+      <includes>
+        <include>logback.xml</include>
+      </includes>
+      <useDefaultExcludes>true</useDefaultExcludes>
+    </fileSet>
+  </fileSets>
+</assembly>