Update to metrics-lib 2.1.0 and to Java 8.

CHANGELOG.md

+# Changes in version 4.1-1.?.? - 2017-??-??
+
+ * Major changes
+   - Update to metrics-lib 2.1.0 and to Java 8.
+
+
 # Changes in version 4.1-1.4.1 - 2017-08-31
 
  * Medium changes

build.xml

@@ -11,7 +11,7 @@
   <property name="onionoo.protocol.version" value="4.1"/>
   <property name="release.version"
             value="${onionoo.protocol.version}-1.4.1-dev"/>
-  <property name="metricslibversion" value="2.0.0"/>
+  <property name="metricslibversion" value="2.1.0"/>
   <property name="jetty.version" value="-9.2.21.v20170120" />
   <property name="warfile"
             value="onionoo-${release.version}.war"/>

build @ a64b94a6

-Subproject commit b491c845ab81027d2f29fe541f8303ff151d3d0b
+Subproject commit a64b94a635e5396266d5c5b5cf88850b9f4b6a24