Add support for ServiceLoader based plugin (requires Graylog2 0.93.0 …

…or higher)

Instead of the old graylog2-plugin.properties file Graylog2 0.93.0 and higher requires a service
file in META-INF/services/org.graylog2.plugin.Plugin which lists all the Plugin classes in the
package.

pom.xml

@@ -31,7 +31,7 @@
 
     <groupId>org.graylog2</groupId>
     <artifactId>graylog2-plugin-archetype</artifactId>
-    <version>0.92.0-SNAPSHOT</version>
+    <version>0.93.0-SNAPSHOT</version>
     <name>graylog2-plugin-archetype</name>
     <url>http://graylog2.org/</url>
     <packaging>maven-archetype</packaging>

src/main/resources/archetype-resources/pom.xml

@@ -11,13 +11,13 @@
 
     <name>${project.artifactId}</name>
     <description>Graylog2 ${project.artifactId} plugin.</description>
-    <url>http://www.graylog2.org</url>
+    <url>https://www.graylog2.org</url>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>1.7</maven.compiler.source>
         <maven.compiler.target>1.7</maven.compiler.target>
-        <graylog2.version>0.90.0</graylog2.version>
+        <graylog2.version>0.93.0-SNAPSHOT</graylog2.version>
         <graylog2.plugin-dir>/usr/share/graylog2-server/plugin</graylog2.plugin-dir>
     </properties>
 

src/main/resources/archetype-resources/src/main/resources/META-INF/services/org.graylog2.plugin.Plugin

@@ -0,0 +1 @@
+${package}.${pluginClassName}Plugin