[FLINK-2059] Changed flink-compiler to flink-optimizer in the pom.xml

This closes #701

flink-staging/flink-language-binding/flink-language-binding-generic/pom.xml

@@ -44,7 +44,7 @@ under the License.
         </dependency>
         <dependency>
             <groupId>org.apache.flink</groupId>
-            <artifactId>flink-compiler</artifactId>
+            <artifactId>flink-optimizer</artifactId>
             <version>${project.version}</version>
         </dependency>
         <dependency>

flink-staging/flink-language-binding/flink-python/pom.xml

@@ -64,7 +64,7 @@ under the License.
         </dependency>
         <dependency>
             <groupId>org.apache.flink</groupId>
-            <artifactId>flink-compiler</artifactId>
+            <artifactId>flink-optimizer</artifactId>
             <version>${project.version}</version>
         </dependency>
         <dependency>