Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit ba7ed18443fb0789526f9d03af7aa34e953aaa6d.
diff --git a/algebricks/algebricks-rewriter/pom.xml b/algebricks/algebricks-rewriter/pom.xml
index 24def19..d4638e6 100644
--- a/algebricks/algebricks-rewriter/pom.xml
+++ b/algebricks/algebricks-rewriter/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache.hyracks</groupId>
     <artifactId>algebricks</artifactId>
-    <version>0.2.18-SNAPSHOT</version>
+    <version>0.2.17-incubating</version>
   </parent>
 
   <licenses>
@@ -59,7 +59,7 @@
   	<dependency>
   		<groupId>org.apache.hyracks</groupId>
   		<artifactId>algebricks-core</artifactId>
-  		<version>0.2.18-SNAPSHOT</version>
+  		<version>0.2.17-incubating</version>
   	</dependency>
   </dependencies>
 </project>