Use the bStats maven artifact

It seems to have issues accessing the maven repository, maybe it's just
an issue with my local setup.

(cherry picked from commit fc8c75c)

pom.xml

@@ -268,6 +268,11 @@
                                     <pattern>javax.inject</pattern>
                                     <shadedPattern>fr.xephi.authme.libs.javax.inject</shadedPattern>
                                 </relocation>
+                                <!-- bStats metrics class -->
+                                <relocation>
+                                    <pattern>org.bstats</pattern>
+                                    <shadedPattern>fr.xephi.authme.libs.org.bstats</shadedPattern>
+                                </relocation>
                             </relocations>
                             <outputFile>target/${project.finalName}-spigot.jar</outputFile>
                         </configuration>
@@ -318,6 +323,11 @@
                                     <pattern>javax.inject</pattern>
                                     <shadedPattern>fr.xephi.authme.libs.javax.inject</shadedPattern>
                                 </relocation>
+                                <!-- bStats metrics class -->
+                                <relocation>
+                                    <pattern>org.bstats</pattern>
+                                    <shadedPattern>fr.xephi.authme.libs.org.bstats</shadedPattern>
+                                </relocation>
                             </relocations>
                             <outputFile>target/${project.finalName}-legacy.jar</outputFile>
                         </configuration>
@@ -424,6 +434,12 @@
             <id>xephi-repo</id>
             <url>http://ci.xephi.fr/plugin/repository/everything/</url>
         </repository>
+
+        <!-- bStats Repo -->
+        <repository>
+            <id>bstats-repo</id>
+            <url>http://repo.bstats.org/content/groups/public</url>
+        </repository>
     </repositories>
 
     <dependencies>
@@ -526,6 +542,13 @@
 
         <!-- Bukkit Libraries  -->
 
+        <!-- bStats metrics -->
+        <dependency>
+            <groupId>org.bstats</groupId>
+            <artifactId>bstats-bukkit</artifactId>
+            <version>1.0</version>
+        </dependency>
+
         <!-- ProtocolLib -->
         <dependency>
             <groupId>com.comphenix.protocol</groupId>

src/main/java/fr/xephi/authme/initialization/OnStartupTasks.java

@@ -6,7 +6,7 @@ import fr.xephi.authme.data.auth.PlayerAuth;
 import fr.xephi.authme.datasource.DataSource;
 import fr.xephi.authme.message.MessageKey;
 import fr.xephi.authme.message.Messages;
-import fr.xephi.authme.metrics.Metrics;
+import org.bstats.Metrics;
 import fr.xephi.authme.output.ConsoleFilter;
 import fr.xephi.authme.output.Log4JFilter;
 import fr.xephi.authme.service.BukkitService;