Adding requirements for needed CI for pelican

requirements

+blinker==1.4
+docutils==0.12
+feedgenerator==1.9
+Jinja2==2.8
+Markdown==2.6.7
+MarkupSafe==0.23
+pelican==3.6.3
+Pygments==2.1.3
+python-dateutil==2.5.3
+pytz==2016.7
+six==1.10.0
+Unidecode==0.4.19