Code cleanup (Removed unused imports, added @Override annotations)

src/com/fsck/k9/activity/FolderList.java

@@ -384,6 +384,7 @@ public class FolderList extends K9ListActivity
     }
 
 
+    @Override
     public void onBackPressed()
     {
         // This will be called either automatically for you on 2.0

src/com/fsck/k9/crypto/Apg.java

@@ -451,6 +451,7 @@ public class Apg extends CryptoProvider
         }
     }
 
+    @Override
     public boolean isEncrypted(Message message)
     {
         String data = null;
@@ -481,6 +482,7 @@ public class Apg extends CryptoProvider
         return matcher.matches();
     }
 
+    @Override
     public boolean isSigned(Message message)
     {
         String data = null;
@@ -527,6 +529,7 @@ public class Apg extends CryptoProvider
      *
      * @return success or failure
      */
+    @Override
     public boolean test(Context context)
     {
         if (!isAvailable(context))

src/com/fsck/k9/crypto/None.java

@@ -69,11 +69,13 @@ public class None extends CryptoProvider
         return false;
     }
 
+    @Override
     public boolean isEncrypted(Message message)
     {
         return false;
     }
 
+    @Override
     public boolean isSigned(Message message)
     {
         return false;

src/com/fsck/k9/mail/internet/MimeUtility.java

@@ -2,7 +2,6 @@
 package com.fsck.k9.mail.internet;
 
 import android.util.Log;
-import com.fsck.k9.R;
 import com.fsck.k9.K9;
 import com.fsck.k9.mail.*;
 import org.apache.commons.io.IOUtils;