Return command from StashCreateCommand setters

Previously were void which made them inconsistent with
the fluid setter pattern used in other commands.

Change-Id: Idb81dfc7bb097306f0c5d6e34f91a2bbab501668
Signed-off-by: Chris Aniszczyk <zx@twitter.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/StashCreateCommand.java

 	 * Set the person to use as the author and committer in the commits made
 	 *
 	 * @param person
+	 * @return {@code this}
 	 */
-	public void setPerson(PersonIdent person) {
+	public StashCreateCommand setPerson(PersonIdent person) {
 		this.person = person;
+		return this;
 	}
 
 	/**
 	 * This value defaults to {@link Constants#R_STASH}
 	 *
 	 * @param ref
+	 * @return {@code this}
 	 */
-	public void setRef(String ref) {
+	public StashCreateCommand setRef(String ref) {
 		this.ref = ref;
+		return this;
 	}
 
 	private RevCommit parseCommit(final ObjectReader reader,