diff --git a/AUTHORS.rst b/AUTHORS.rst
index b93507b..dc2e98c 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -1,12 +1,36 @@
-GRequests is written and maintained by Kenneth Reitz and
+GRequests is authored by Kenneth Reitz, maintained by Spencer Young and 
 various contributors:
 
-Development Lead
-````````````````
+Development Leads
+`````````````````
 
+- Spencer Phillip Young <spencer.young@spyoung.com>
 - Kenneth Reitz <me@kennethreitz.com>
 
 Patches and Suggestions
 ```````````````````````
-- Kracekumar <me@kracekumar.com>
-- Spencer Young <spencer.young@spyoung.com>
+
+Adam Tauber <asciimoo@gmail.com>
+Akshat Mahajan <akshatm.bkk@gmail.com>
+Alexander Simeonov <agsimeonov@gmail.com>
+Antonio A <andrade.antonio@gmail.com>
+Chris Drackett <chris@drackett.com>
+Eugene Eeo <packwolf58@gmail.com>
+Frost Ming <mianghong@gmail.com>
+Ian Cordasco <icordasc+github@coglib.com>
+Joe Gordon <jogo@pinterest.com>
+Luke Hutscal <luke@creaturecreative.com>
+Marc Abramowitz <marc@marc-abramowitz.com>
+Mathieu Lecarme <mlecarme@bearstech.com>
+Michael Newman <newmaniese@gmail.com>
+Mircea Ulinic <mirceaulinic@users.noreply.github.com>
+Nate Lawson <nate@root.org>
+Nathan Hoad <nathan@getoffmalawn.com>
+Roman Haritonov <reclosedev@gmail.com>
+Ryan T. Dean <ryand@netflix.com>
+Spencer Phillip Young <spencer.young@spyoung.com>
+Spencer Young <spencer.young@spyoung.com>
+Yuri Prezument <y@yprez.com>
+koobs <koobs@users.noreply.github.com>
+kracekumar <kracethekingmaker@gmail.com>
+崔庆才丨静觅 <cqc@cuiqingcai.com>
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..9d5d250
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,2 @@
+include LICENSE
+include README.rst
diff --git a/README.rst b/README.rst
index 3ea3e86..e586c5f 100644
--- a/README.rst
+++ b/README.rst
@@ -3,6 +3,9 @@
 
 GRequests allows you to use Requests with Gevent to make asynchronous HTTP
 Requests easily.
+
+|version| |pyversions|
+
 
 **Note**: You should probably use `requests-threads <https://github.com/requests/requests-threads>`_ or `requests-futures <https://github.com/ross/requests-futures>`_ instead.
 
@@ -45,7 +48,7 @@
 .. code-block:: python
 
     >>> def exception_handler(request, exception):
-    ...    print "Request failed"
+    ...    print("Request failed")
 
     >>> reqs = [
     ...    grequests.get('http://httpbin.org/delay/1', timeout=0.001),
@@ -65,3 +68,10 @@
 
     $ pip install grequests
     ✨🍰✨
+
+
+.. |version| image:: https://img.shields.io/pypi/v/grequests.svg?colorB=blue
+    :target: https://pypi.org/project/grequests/
+
+.. |pyversions| image:: https://img.shields.io/pypi/pyversions/grequests.svg?
+    :target: https://pypi.org/project/grequests/
diff --git a/grequests.py b/grequests.py
index 582cffb..f4ec5c7 100755
--- a/grequests.py
+++ b/grequests.py
@@ -10,6 +10,7 @@
 """
 from functools import partial
 import traceback
+
 try:
     import gevent
     from gevent import monkey as curious_george
@@ -21,7 +22,6 @@
 curious_george.patch_all(thread=False, select=False)
 
 from requests import Session
-
 
 __all__ = (
     'map', 'imap',
@@ -47,6 +47,9 @@
         self.session = kwargs.pop('session', None)
         if self.session is None:
             self.session = Session()
+            self._close = True
+        else:
+            self._close = False  # don't close adapters after each request if the user provided the session
 
         callback = kwargs.pop('callback', None)
         if callback:
@@ -73,6 +76,11 @@
         except Exception as e:
             self.exception = e
             self.traceback = traceback.format_exc()
+        finally:
+            if self._close:
+                # if we provided the session object, make sure we're cleaning up
+                # because there's no sense in keeping it open at this point if it wont be reused
+                self.session.close()
         return self
 
 
@@ -123,6 +131,8 @@
             ret.append(request.response)
         elif exception_handler and hasattr(request, 'exception'):
             ret.append(exception_handler(request, request.exception))
+        elif exception_handler and not hasattr(request, 'exception'):
+            ret.append(exception_handler(request, None))
         else:
             ret.append(None)
 
diff --git a/setup.py b/setup.py
index defc7cf..9122abd 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@
 
 setup(
     name='grequests',
-    version='0.4.0',
+    version='0.6.0',
     url='https://github.com/kennethreitz/grequests',
     license='BSD',
     author='Kenneth Reitz',