Expose ConnectionException and subclasses.

Author: olim7t

driver-core/src/main/java/com/datastax/driver/core/ConnectionException.java

@@ -17,7 +17,11 @@
 
 import java.net.InetSocketAddress;
 
-class ConnectionException extends Exception {
+/**
+ * Indicates that a connection to a host has encountered a problem
+ * and that it should be closed.
+ */
+public class ConnectionException extends Exception {
 
     private static final long serialVersionUID = 0;
 

driver-core/src/main/java/com/datastax/driver/core/OperationTimedOutException.java

@@ -21,7 +21,7 @@
  * Thrown on a client-side timeout, i.e. when the client didn't hear back from the server within
  * {@link SocketOptions#getReadTimeoutMillis()}.
  */
-class OperationTimedOutException extends ConnectionException {
+public class OperationTimedOutException extends ConnectionException {
     public OperationTimedOutException(InetSocketAddress address) {
         super(address, "Operation timed out");
     }

driver-core/src/main/java/com/datastax/driver/core/TransportException.java

@@ -21,7 +21,7 @@
  * A connection exception that has to do with the transport itself, i.e. that
  * suggests the node is down.
  */
-class TransportException extends ConnectionException {
+public class TransportException extends ConnectionException {
     private static final long serialVersionUID = 0;
 
     public TransportException(InetSocketAddress address, String msg, Throwable cause) {