pelican-quickstart: switch to jinja2

- Use the jinja2 templating language for Makefile, fabfile,
  pelicanconf, publishconf, and develop-server.sh
- Add logic in pelican_quickstart.py
- Let jinja2 handle opening and reading template files
- Remove thus unused functions for string.Template

pelican/tools/templates/pelicanconf.py.in

@@ -1,35 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*- #
-from __future__ import unicode_literals
-
-AUTHOR = $author
-SITENAME = $sitename
-SITEURL = ''
-
-PATH = 'content'
-
-TIMEZONE = $timezone
-
-DEFAULT_LANG = $lang
-
-# Feed generation is usually not desired when developing
-FEED_ALL_ATOM = None
-CATEGORY_FEED_ATOM = None
-TRANSLATION_FEED_ATOM = None
-AUTHOR_FEED_ATOM = None
-AUTHOR_FEED_RSS = None
-
-# Blogroll
-LINKS = (('Pelican', 'http://getpelican.com/'),
-         ('Python.org', 'http://python.org/'),
-         ('Jinja2', 'http://jinja.pocoo.org/'),
-         ('You can modify those links in your config file', '#'),)
-
-# Social widget
-SOCIAL = (('You can add links in your config file', '#'),
-          ('Another social link', '#'),)
-
-DEFAULT_PAGINATION = $default_pagination
-
-# Uncomment following line if you want document-relative URLs when developing
-#RELATIVE_URLS = True