Remove unused exception class

ethereumj-core/src/main/java/org/ethereum/crypto/KeyCrypterException.java

@@ -1,21 +0,0 @@
-package org.ethereum.crypto;
-/**
- * <p>Exception to provide the following to {@link EncrypterDecrypterOpenSSL}:</p>
- * <ul>
- * <li>Provision of encryption / decryption exception</li>
- * </ul>
- * <p>This base exception acts as a general failure mode not attributable to a specific cause (other than
- * that reported in the exception message). Since this is in English, it may not be worth reporting directly
- * to the user other than as part of a "general failure to parse" response.</p>
- */
-public class KeyCrypterException extends RuntimeException {
-    private static final long serialVersionUID = -4441989608332681377L;
-
-    public KeyCrypterException(String s) {
-        super(s);
-    }
-
-    public KeyCrypterException(String s, Throwable throwable) {
-        super(s, throwable);
-    }
-}