Remove unused imports.

Author: Capstan

src/main/java/com/github/fge/jackson/JacksonUtils.java

@@ -33,7 +33,6 @@
 
 import java.io.IOException;
 import java.io.StringWriter;
-import java.util.Collections;
 import java.util.Iterator;
 import java.util.Map;
 

src/main/java/com/github/fge/jackson/jsonpointer/ReferenceToken.java

@@ -24,7 +24,6 @@
 import com.google.common.collect.ImmutableList;
 
 import java.nio.CharBuffer;
-import java.util.List;
 import javax.annotation.concurrent.Immutable;