Fix bug in list_missions()

Resubmitting bug fix I accidentally deleted.

break a long line

remove redundant backslash (PEP 8)

Fix placement of rstrip

fix whitespace PEP 8 issues

Author: odysseus9672

astroquery/ibe/core.py

@@ -276,7 +276,9 @@ def list_missions(self, cache=True):
 
             root = BeautifulSoup(response.text)
             links = root.findAll('a')
-            missions = [os.path.basename(a.attrs['href']) for a in links]
+
+            missions = [os.path.basename(a.attrs['href'].rstrip('/'))
+                            for a in links]
             self._missions = missions
 
         return missions