Remove unused imports and variables

app/src/main/java/org/isoron/uhabits/commands/ChangeHabitColorCommand.java

@@ -23,7 +23,6 @@ import org.isoron.uhabits.R;
 import org.isoron.uhabits.models.Habit;
 
 import java.util.ArrayList;
-import java.util.LinkedList;
 import java.util.List;
 
 public class ChangeHabitColorCommand extends Command

app/src/main/java/org/isoron/uhabits/io/CSVExporter.java

@@ -111,8 +111,6 @@ public class CSVExporter
 
     private void writeFiles(Habit habit) throws IOException
     {
-        boolean success;
-
         String path = String.format("%s/", habit.name);
         new File(basePath + path).mkdirs();
         generateDirs.add(path);