Prepare for 4.1-1.5.0 release.

CHANGELOG.md

-# Changes in version 4.1-1.?.? - 2017-??-??
+# Changes in version 4.1-1.5.0 - 2017-09-15
 
  * Major changes
    - Update to metrics-lib 2.1.0 and to Java 8.

build.xml

@@ -10,7 +10,7 @@
   <property name="implementation-title" value="Onionoo" />
   <property name="onionoo.protocol.version" value="4.1"/>
   <property name="release.version"
-            value="${onionoo.protocol.version}-1.4.1-dev"/>
+            value="${onionoo.protocol.version}-1.5.0"/>
   <property name="metricslibversion" value="2.1.0"/>
   <property name="jetty.version" value="-9.2.21.v20170120" />
   <property name="warfile"