bump dependencies and plugins

pom.xml

@@ -54,6 +54,10 @@
     </repository>
   </repositories>
 
+  <prerequisites>
+    <maven>3.0.4</maven>
+  </prerequisites>
+
   <dependencies>
     <dependency>
       <groupId>io.socket</groupId>
@@ -68,7 +72,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.11</version>
+      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -129,7 +133,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-gpg-plugin</artifactId>
-        <version>1.5</version>
+        <version>1.6</version>
         <executions>
           <execution>
             <id>sign-artifacts</id>
@@ -143,7 +147,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>
-        <version>2.2.1</version>
+        <version>2.4</version>
         <executions>
           <execution>
             <id>attach-sources</id>
@@ -156,7 +160,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>2.9.1</version>
+        <version>2.10.3</version>
         <executions>
           <execution>
             <id>attach-javadocs</id>
@@ -180,7 +184,7 @@
       <plugin>
         <groupId>org.sonatype.plugins</groupId>
         <artifactId>nexus-staging-maven-plugin</artifactId>
-        <version>1.6.2</version>
+        <version>1.6.6</version>
         <extensions>true</extensions>
         <configuration>
           <serverId>ossrh</serverId>
@@ -191,7 +195,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>exec-maven-plugin</artifactId>
-        <version>1.2.1</version>
+        <version>1.4.0</version>
         <executions>
           <execution>
             <id>npm-install</id>
@@ -217,7 +221,7 @@
       <plugin>
         <groupId>com.github.github</groupId>
         <artifactId>site-maven-plugin</artifactId>
-        <version>0.10</version>
+        <version>0.12</version>
         <configuration>
           <message>Creating site for ${project.version}</message>
         </configuration>