Use author date to be consistent with other tools (fixes #919)

James Moger

2015-09-18 a592329a82d0a85d33abcc63f08df20b79e8e4f7

 src/main/java/com/gitblit/models/RefModel.java

@@ -58,9 +58,9 @@
            }

         } else if (referencedObject instanceof RevCommit) {

            RevCommit commit = (RevCommit) referencedObject;

            PersonIdent committer = commit.getCommitterIdent();

            if (committer != null) {

               date = committer.getWhen();

            PersonIdent author = commit.getAuthorIdent();

            if (author != null) {

               date = author.getWhen();

            } else {

               date = JGitUtils.getCommitDate(commit);

            }