Update notes for submitted changes

* SignedPushConfig: Allow setting a custom nonce generator impl
* PackCertificateParser: return null if nothing was received
* Include push certificates in RefUpdate
* Remove redundant @since tags in new signed push classes

85/6db79b1d6b74dc4e024a154cdcf96bb70188c7

@@ -0,0 +1,7 @@
+Verified+1: Hudson CI
+Code-Review+2: Shawn Pearce <spearce@spearce.org>
+Submitted-by: Dave Borowitz <dborowitz@google.com>
+Submitted-at: Thu, 18 Jun 2015 13:46:52 -0400
+Reviewed-on: https://git.eclipse.org/r/50446
+Project: jgit/jgit
+Branch: refs/heads/master

d2/fbbc910a8ecc6cec36354b09fc276b5a236543

@@ -0,0 +1,7 @@
+Verified+1: Hudson CI
+Code-Review+2: Shawn Pearce <spearce@spearce.org>
+Submitted-by: Dave Borowitz <dborowitz@google.com>
+Submitted-at: Thu, 18 Jun 2015 13:46:39 -0400
+Reviewed-on: https://git.eclipse.org/r/50461
+Project: jgit/jgit
+Branch: refs/heads/master

ea/21f17f294ac6fcb6d7135faa8d562e45bf03b1

@@ -0,0 +1,7 @@
+Verified+1: Hudson CI
+Code-Review+2: Shawn Pearce <spearce@spearce.org>
+Submitted-by: Dave Borowitz <dborowitz@google.com>
+Submitted-at: Thu, 18 Jun 2015 13:46:45 -0400
+Reviewed-on: https://git.eclipse.org/r/50451
+Project: jgit/jgit
+Branch: refs/heads/master

fc/6790a5d716955d690fd441c6f21d2f64815721

@@ -0,0 +1,7 @@
+Verified+1: Hudson CI
+Code-Review+2: Shawn Pearce <spearce@spearce.org>
+Submitted-by: Dave Borowitz <dborowitz@google.com>
+Submitted-at: Thu, 18 Jun 2015 13:46:48 -0400
+Reviewed-on: https://git.eclipse.org/r/50447
+Project: jgit/jgit
+Branch: refs/heads/master