Fixed #40 - make sure the branch name is correctly looked up when freezing an...

Fixed #40 - make sure the branch name is correctly looked up when freezing an editable packages from a Git repository

docs/news.txt

@@ -11,6 +11,8 @@ tip
   writing them to a file. Use simple redirection (e.g.
   ``pip freeze > stable-req.txt``) to get a file with requirements.
 
+* Fixed problem of freezing an editable packages from a Git repository.
+
 0.4
 ---
 

pip.py

@@ -2903,6 +2903,7 @@ class Git(VersionControl):
             [GIT_CMD, 'branch', '-r'], show_stdout=False, cwd=location)
         branch_revs = []
         for line in branches.splitlines():
+            line = line.split('->')[0].strip()
             branch = "".join([b for b in line.split() if b != '*'])
             rev = call_subprocess(
                 [GIT_CMD, 'rev-parse', branch], show_stdout=False, cwd=location)