Renamed main class file to be consistent

The other track problems follow this convention as well.

strain/example.java

@@ -8,7 +8,7 @@ public class Strain {
 	{
 		return coll.stream().filter(func).collect(Collectors.toList());
 	}
-	
+
 	public static <T> Collection<T> discard(Collection<T> coll, Predicate<T> func)
 	{
 		return coll.stream().filter(func.negate()).collect(Collectors.toList());

strain/src/test/java/StrainTest.java

@@ -1,12 +1,10 @@
-package strain;
+import org.junit.Assert;
+import org.junit.Test;
 
 import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.List;
 
-import org.junit.Assert;
-import org.junit.Test;
-
 public class StrainTest {
 
 	@Test