Add GHCompare.getFiles() method to be able to see the precise files c…

…hanged.

There is a file field inside of GHCompare but no getter to extract the values
for analysis.

There are contents in that field so I've added a new get method so that they
can be extracted.

src/main/java/org/kohsuke/github/GHCompare.java

@@ -68,9 +68,12 @@ public Commit getMergeBaseCommit() {
     public Commit[] getCommits() {
         return commits;
     }
+
+    public GHCommit.File[] getFiles() {
+		return files;
+	}
 
-
-    public GHCompare wrap(GHRepository owner) {
+	public GHCompare wrap(GHRepository owner) {
         this.owner = owner;
         for (Commit commit : commits) {
             commit.wrapUp(owner);