fixed output name of manifest file

Author: johnscancella

src/main/java/gov/loc/repository/bagit/hash/StandardSupportedAlgorithms.java

@@ -22,6 +22,6 @@ public String getMessageDigestName() {
 
   @Override
   public String getBagitName() {
-    return name();
+    return name().toLowerCase();
   }
 }

src/main/java/gov/loc/repository/bagit/verify/BagVerifier.java

@@ -30,7 +30,6 @@
 import gov.loc.repository.bagit.exceptions.MissingPayloadDirectoryException;
 import gov.loc.repository.bagit.exceptions.MissingPayloadManifestException;
 import gov.loc.repository.bagit.exceptions.PayloadOxumDoesNotExistException;
-import gov.loc.repository.bagit.hash.SupportedAlgorithm;
 import gov.loc.repository.bagit.reader.BagReader;
 import gov.loc.repository.bagit.tasks.CheckIfFileExistsTask;
 import gov.loc.repository.bagit.tasks.CheckManifestHashsTask;