Version the greenlet dependency in setup.py to the latest (which was required...

Version the greenlet dependency in setup.py to the latest (which was required by gevent 1.0.2 as well).

Remove the in-code checking for greenlet version in gevent.hub to avoid repetition (the version it was checking for was released in 2011).

Fixes #435.

gevent/hub.py

@@ -6,12 +6,6 @@ import os
 import traceback
 
 import greenlet  # http://pypi.python.org/pypi/greenlet/
-greenlet_version = getattr(greenlet, '__version__', None)
-if greenlet_version:
-    greenlet_version_info = [int(x) for x in greenlet_version.split('.')]
-if not greenlet_version or greenlet_version_info[:3] < [0, 3, 2]:
-    raise ImportError('''Your version of greenlet (%s) is too old (required >= 0.3.2)
-             You can get a newer version of greenlet from http://pypi.python.org/pypi/greenlet/''' % (greenlet_version, ))
 from greenlet import greenlet, getcurrent, GreenletExit
 
 

setup.py

@@ -286,12 +286,15 @@ def read(name, *args):
     except OSError:
         return ''
 
+if PYPY:
+    install_requires = []
+else:
+    install_requires = ['greenlet >= 0.4.7']
 
 # If we are running info / help commands, we don't need to build anything
 if len(sys.argv) >= 2 and ('--help' in sys.argv[1:] or
    sys.argv[1] in ('--help-commands', 'egg_info', '--version', 'clean')):
     ext_modules = []
-    install_requires = [] if PYPY else ['greenlet']
     include_package_data = PYPY
     run_make = False
 elif PYPY:
@@ -302,7 +305,6 @@ elif PYPY:
     system('cd gevent/libev && ./configure > configure_output.txt')
     from gevent import corecffi
     ext_modules = [corecffi.ffi.verifier.get_extension()]
-    install_requires = []
     include_package_data = True
     run_make = False
 else:
@@ -312,7 +314,6 @@ else:
                              sources=["gevent/gevent._semaphore.c"]),
                    Extension(name="gevent._util",
                              sources=["gevent/gevent._util.c"])]
-    install_requires = ['greenlet']
     include_package_data = False
     run_make = True