updating download to not use github plugin

Author: vsoch

setup.py

@@ -7,7 +7,7 @@
     name="singularity",
 
     # Version number:
-    version="0.89",
+    version="0.90",
 
     # Application author details:
     author="Vanessa Sochat",

singularity/utils.py

@@ -313,5 +313,7 @@ def download_repo(repo_url,destination,commit=None):
     :param repo_url: the url of the repo to clone from
     :param destination: the full path to the destination for the repo
     '''
-    return Repo.clone_from(repo_url, destination)
+    command = "git clone %s %s" %(repo_url,destination)
+    os.system(command)
+    return destination