gpg.patch

diff --git a/git/objects/commit.py b/git/objects/commit.py
index cbfd509..88b3042 100644
--- a/git/objects/commit.py
+++ b/git/objects/commit.py
@@ -57,12 +57,12 @@ class Commit(base.Object, Iterable, Diffable, Traversable, Serializable):
     __slots__ = ("tree",
                  "author", "authored_date", "author_tz_offset",
                  "committer", "committed_date", "committer_tz_offset",
-                 "message", "parents", "encoding")
+                 "message", "parents", "encoding", "gpgsig")
     _id_attribute_ = "binsha"

     def __init__(self, repo, binsha, tree=None, author=None, authored_date=None, author_tz_offset=None,
                  committer=None, committed_date=None, committer_tz_offset=None,
-                 message=None,  parents=None, encoding=None):
+                 message=None,  parents=None, encoding=None, gpgsig=None):
         """Instantiate a new Commit. All keyword arguments taking None as default will
         be implicitly set on first query.

@@ -120,6 +120,7 @@ class Commit(base.Object, Iterable, Diffable, Traversable, Serializable):
             self.parents = parents
         if encoding is not None:
             self.encoding = encoding
+        self.gpgsig = gpgsig

     @classmethod
     def _get_intermediate_items(cls, commit):
@@ -393,7 +394,12 @@ class Commit(base.Object, Iterable, Diffable, Traversable, Serializable):

         if self.encoding != self.default_encoding:
             write("encoding %s\n" % self.encoding)
-
+
+        if self.gpgsig:
+            write("gpgsig")
+            for sigline in self.gpgsig.rstrip("\n").split("\n"):
+                write(" " + sigline + "\n")
+
         write("\n")

         # write plain bytes, be sure its encoded according to our encoding
@@ -429,15 +435,29 @@ class Commit(base.Object, Iterable, Diffable, Traversable, Serializable):
         # now we can have the encoding line, or an empty line followed by the optional
         # message.
         self.encoding = self.default_encoding
-        # read encoding or empty line to separate message
-        enc = readline()
-        enc = enc.strip()
-        if enc:
-            self.encoding = enc[enc.find(' ')+1:]
-            # now comes the message separator
-            readline()
-        # END handle encoding
-
+
+        # read headers
+        buf = readline().strip()
+        while buf != "":
+            if buf[0:10] == "encoding ":
+                self.encoding = buf[buf.find(' ')+1:]
+            elif buf[0:7] == "gpgsig ":
+                sig = buf[buf.find(' ')+1:] + "\n"
+                is_next_header = False
+                while True:
+                    sigbuf = readline()
+                    if sigbuf == "":
+                        break
+                    if sigbuf[0:1] != " ":
+                        buf = sigbuf.strip()
+                        is_next_header = True
+                        break
+                    sig += sigbuf[1:]
+                    self.gpgsig = sig.rstrip("\n")
+                    if is_next_header:
+                        continue
+            buf = readline().strip()
+
         # decode the authors name
         try:
             self.author.name = self.author.name.decode(self.encoding)