Prepare for 1.7.0 release.

CERT

 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

CHANGELOG.md

-# Changes in version 1.7.0 - ???
+# Changes in version 1.7.0 - 2017-05-17
 
  * Medium changes
    - Fix a bug where unrecognized lines in extra-info descriptors

build.xml

@@ -6,7 +6,7 @@
 
 <project default="usage" name="descriptor" basedir=".">
 
-  <property name="release.version" value="1.6.0-dev" />
+  <property name="release.version" value="1.7.0" />
   <property name="javadoc-title" value="DescripTor API Documentation"/>
   <property name="javadoc-excludes" value="**/impl/** **/index/**" />
   <property name="implementation-title" value="DescripTor" />