Update MongoDB Async Driver version.

pom.xml

@@ -51,7 +51,7 @@
     <openjpa.jdbc.version>2.1.1</openjpa.jdbc.version>
     <!--<mapkeeper.version>1.0</mapkeeper.version>-->
     <mongodb.version>2.13.1</mongodb.version>
-    <mongodb.async.version>1.2.3</mongodb.async.version>
+    <mongodb.async.version>2.0.0-SNAPSHOT</mongodb.async.version>
     <orientdb.version>1.0.1</orientdb.version>
     <redis.version>2.0.0</redis.version>
     <voldemort.version>0.81</voldemort.version>
@@ -111,5 +111,38 @@
         </executions>
       </plugin>
     </plugins>
+    <pluginManagement>
+    	<plugins>
+    		<!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
+    		<plugin>
+    			<groupId>org.eclipse.m2e</groupId>
+    			<artifactId>lifecycle-mapping</artifactId>
+    			<version>1.0.0</version>
+    			<configuration>
+    				<lifecycleMappingMetadata>
+    					<pluginExecutions>
+    						<pluginExecution>
+    							<pluginExecutionFilter>
+    								<groupId>
+    									org.apache.maven.plugins
+    								</groupId>
+    								<artifactId>
+    									maven-checkstyle-plugin
+    								</artifactId>
+    								<versionRange>[2.6,)</versionRange>
+    								<goals>
+    									<goal>checkstyle</goal>
+    								</goals>
+    							</pluginExecutionFilter>
+    							<action>
+    								<ignore></ignore>
+    							</action>
+    						</pluginExecution>
+    					</pluginExecutions>
+    				</lifecycleMappingMetadata>
+    			</configuration>
+    		</plugin>
+    	</plugins>
+    </pluginManagement>
   </build>
 </project>