[FIX] requirements.txt : gevent & greenlet versions updated

gevent 1.0.1 (old) causes issue on Debian 8.0 Jessie : Disk running out of free space
Cause: /var/log/syslog and /var/log/daemon.log full of "NameError: name 'PROTOCOL_SSLv3' is not defined"

FYI: disk of 20GB runs out of space in less than 24h!

gevent 1.0.2 release notes : https://github.com/gevent/gevent/blob/1.0.2/changelog.rst#release-102-may-23-2015

requirements.txt

@@ -11,8 +11,8 @@ decorator==3.4.0
 docutils==0.12
 feedparser==5.1.3
 gdata==2.0.18
-gevent==1.0.1
-greenlet==0.4.2
+gevent==1.0.2
+greenlet==0.4.7
 jcconv==0.2.3
 lxml==3.3.5
 mock==1.0.1