add backwards and forewards button for PDF links

[Karl-Philipp Richter]

Clicking on a link in a PDF file accidentially scrolls to the position of the link target. There should be a possibility in form of a back button (like in a browser) which allow to undo the jump and redo it after it has been undone (in form of a forwards button).

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: evince 3.14.1-0ubuntu1
ProcVersionSignature: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/proc/version_signature'
Uname: Linux 3.18.1-031801-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Dec 20 00:37:56 2014
KernLog:

SourcePackage: evince
UpgradeStatus: No upgrade log present (probably fresh install)