Update JavaHL to use the revised svn_client_mergeinfo_log API.

[in subversion/bindings/javahl/src/org/apache/subversion/javahl]
* ISVNClient.java, SVNClient.java (ISVNClient.getMergeinfoLog):
   Add overload that accepts the start and end source revision.

[i  subversion/bindings/javahl/native]
* SVNClient.h, SVNClient.cpp (SVNClient::getMergeinfoLog):
   Update native implementation to use the revision range.
  (org_apache_subversion_javahl_SVNClient.cpp): Update JNI wrapper.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1463814 13f79535-47bb-0310-9956-ffa450edef68