add intersphinx support thanks to @jayhesselberth

docs/conf.py

@@ -51,9 +51,9 @@ copyright = u'2009 - 2013, Aaron R. Quinlan'
 # built documents.
 #
 # The short X.Y version.
-version = '2.18.0'
+version = '2.19.0'
 # The full version, including alpha/beta/rc tags.
-release = '2.18.0'
+release = '2.19.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -223,7 +223,7 @@ man_pages = [
 ]
 
 # Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'http://docs.python.org/': None}
+intersphinx_mapping = {'bedtools': ('http://bedtools.readthedocs.org/en/latest/', None)}
 
 class Mock(object):
     def __init__(self, *args, **kwargs):