DOC: Update date

Courses/org/WorkshopGuide/workshopGuide-en.org

 #+TITLE: Guide for OTB training courses
 #+AUTHOR: OTB team
-#+DATE: 2016
+#+DATE: 2017
 
 #+OPTIONS: H:5
 #+LaTeX_CLASS: article

Courses/org/WorkshopGuide/workshopSlides-en.org

 #+TITLE: Guide for OTB training courses
 #+AUTHOR: OTB team
-#+DATE: 2016
+#+DATE: 2017
 
 #+startup: beamer
 #+startup: oddeven

Courses/org/WorkshopGuide/workshopSolution-en.org

 #+TITLE:  Guide for OTB training courses (Solutions) 
 #+AUTHOR: OTB Team
-#+DATE: 2016
+#+DATE: 2017
 #+OPTIONS: H:4
 #+LaTeX_CLASS: article
 #+LaTeX_CLASS_OPTIONS: [a4paper,10pt,twoside,pdftex,openright]