Update sphinx to the version used by RTD, and fix LaTeX output

LaTeX don't like mixing sphinxcode and href, which we did thanks to
the extensions gh_tree and gh_blob. The easy workaround is to remove
the code styling from the output of those.

Author: stefano-maggiolo

dev-requirements.txt

@@ -5,4 +5,4 @@ mock==1.0.1
 mechanize==0.2.5
 
 # Only for building documentation
-Sphinx==1.3.1
+Sphinx==1.5.3

docs/conf.py

@@ -41,7 +41,7 @@
 
 # General information about the project.
 project = u'CMS'
-copyright = u'2013, The CMS development team'
+copyright = u'2017, The CMS development team'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the

docs/gh_links.py

@@ -50,9 +50,7 @@ def gh_tree(typ, rawtext, text, lineno, inliner, options={}, content=[]):
         full_url = 'https://github.com/cms-dev/cms/tree/v%s/%s' % (app.config.release, part)
 
         refnode = nodes.reference(title, title, internal=False, refuri=full_url, **options)
-        retnode = nodes.literal(role=typ.lower(), classes=[typ])
-        retnode += refnode
-        return [retnode], []
+        return [refnode], []
     return gh_tree
 
 def make_gh_blob(app):
@@ -64,9 +62,7 @@ def gh_blob(typ, rawtext, text, lineno, inliner, options={}, content=[]):
         full_url = 'https://github.com/cms-dev/cms/blob/v%s/%s' % (app.config.release, part)
 
         refnode = nodes.reference(title, title, internal=False, refuri=full_url, **options)
-        retnode = nodes.literal(role=typ.lower(), classes=[typ])
-        retnode += refnode
-        return [retnode], []
+        return [refnode], []
     return gh_blob
 
 def setup_roles(app):