Expand unexpanded globs earlier than before

If we receive a glob that was unexpanded, we already expand that.
However, we were not then updating our signatures dictionary and as
such we were probably uploading packages and signatures incorrectly in
that very rare case.

This changes twine-upload to expand those globs much earlier in the
execution so we do not miss any signature data or anything else while
uploading a package.

Related to pypa#132

tests/test_upload.py

@@ -66,6 +66,7 @@ def test_find_dists_handles_real_files():
 
 def test_get_config_old_format(tmpdir):
     pypirc = os.path.join(str(tmpdir), ".pypirc")
+    dists = ["tests/fixtures/twine-1.5.0-py2.py3-none-any.whl"]
 
     with open(pypirc, "w") as fp:
         fp.write(textwrap.dedent("""
@@ -75,7 +76,7 @@ def test_get_config_old_format(tmpdir):
         """))
 
     try:
-        upload.upload(dists="foo", repository="pypi", sign=None, identity=None,
+        upload.upload(dists=dists, repository="pypi", sign=None, identity=None,
                       username=None, password=None, comment=None,
                       sign_with=None, config_file=pypirc, skip_existing=False)
     except KeyError as err:

twine/commands/upload.py

@@ -67,11 +67,13 @@ def upload(dists, repository, sign, identity, username, password, comment,
     if not sign and identity:
         raise ValueError("sign must be given along with identity")
 
+    dists = find_dists(dists)
+
     # Determine if the user has passed in pre-signed distributions
     signatures = dict(
         (os.path.basename(d), d) for d in dists if d.endswith(".asc")
     )
-    dists = [i for i in dists if not i.endswith(".asc")]
+    uploads = [i for i in dists if not i.endswith(".asc")]
 
     config = utils.get_repository_from_config(config_file, repository)
 
@@ -86,8 +88,6 @@ def upload(dists, repository, sign, identity, username, password, comment,
 
     repository = Repository(config["repository"], username, password)
 
-    uploads = find_dists(dists)
-
     for filename in uploads:
         package = PackageFile.from_filename(filename, comment)