Add tests progress indicator

Looks like this:

    Suite: org.elasticsearch.search.aggregations.bucket.HistogramTests
    Completed [10/713] on J0 in 8.32s, 27 tests

    Suite: org.elasticsearch.indices.state.OpenCloseIndexTests
    Completed [11/713] on J2 in 16.23s, 20 tests

Upgrades randomizedtesting to 2.1.13.

pom.xml

@@ -80,7 +80,7 @@
         <dependency>
             <groupId>com.carrotsearch.randomizedtesting</groupId>
             <artifactId>randomizedtesting-runner</artifactId>
-            <version>2.1.11</version>
+            <version>2.1.13</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -501,7 +501,7 @@
             <plugin>
                 <groupId>com.carrotsearch.randomizedtesting</groupId>
                 <artifactId>junit4-maven-plugin</artifactId>
-                <version>2.1.2</version>
+                <version>2.1.13</version>
                 <executions>
                     <execution>
                         <id>tests</id>