[hotfix] Remove redundant directories

This closes #55.
diff --git a/flink-ml-lib/src/test/java/org/apache/flink/ml/classification/knn/KnnTest.java b/flink-ml-lib/src/test/java/org/apache/flink/ml/classification/KnnTest.java
similarity index 97%
rename from flink-ml-lib/src/test/java/org/apache/flink/ml/classification/knn/KnnTest.java
rename to flink-ml-lib/src/test/java/org/apache/flink/ml/classification/KnnTest.java
index 2811a7c..133cd74 100644
--- a/flink-ml-lib/src/test/java/org/apache/flink/ml/classification/knn/KnnTest.java
+++ b/flink-ml-lib/src/test/java/org/apache/flink/ml/classification/KnnTest.java
@@ -16,12 +16,15 @@
  * limitations under the License.
  */
 
-package org.apache.flink.ml.classification.knn;
+package org.apache.flink.ml.classification;
 
 import org.apache.flink.api.common.functions.MapFunction;
 import org.apache.flink.api.common.restartstrategy.RestartStrategies;
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.configuration.Configuration;
+import org.apache.flink.ml.classification.knn.Knn;
+import org.apache.flink.ml.classification.knn.KnnModel;
+import org.apache.flink.ml.classification.knn.KnnModelData;
 import org.apache.flink.ml.linalg.DenseMatrix;
 import org.apache.flink.ml.linalg.DenseVector;
 import org.apache.flink.ml.linalg.Vectors;
diff --git a/flink-ml-lib/src/test/java/org/apache/flink/ml/classification/logisticregression/LogisticRegressionTest.java b/flink-ml-lib/src/test/java/org/apache/flink/ml/classification/LogisticRegressionTest.java
similarity index 97%
rename from flink-ml-lib/src/test/java/org/apache/flink/ml/classification/logisticregression/LogisticRegressionTest.java
rename to flink-ml-lib/src/test/java/org/apache/flink/ml/classification/LogisticRegressionTest.java
index e7dc036..2c73564 100644
--- a/flink-ml-lib/src/test/java/org/apache/flink/ml/classification/logisticregression/LogisticRegressionTest.java
+++ b/flink-ml-lib/src/test/java/org/apache/flink/ml/classification/LogisticRegressionTest.java
@@ -16,13 +16,16 @@
  * limitations under the License.
  */
 
-package org.apache.flink.ml.classification.logisticregression;
+package org.apache.flink.ml.classification;
 
 import org.apache.flink.api.common.restartstrategy.RestartStrategies;
 import org.apache.flink.api.common.typeinfo.TypeInformation;
 import org.apache.flink.api.common.typeinfo.Types;
 import org.apache.flink.api.java.typeutils.RowTypeInfo;
 import org.apache.flink.configuration.Configuration;
+import org.apache.flink.ml.classification.logisticregression.LogisticRegression;
+import org.apache.flink.ml.classification.logisticregression.LogisticRegressionModel;
+import org.apache.flink.ml.classification.logisticregression.LogisticRegressionModelData;
 import org.apache.flink.ml.linalg.DenseVector;
 import org.apache.flink.ml.linalg.Vectors;
 import org.apache.flink.ml.util.ReadWriteUtils;