Updating all requirements to more reasonable versions

requirements.txt

@@ -1,13 +1,13 @@
-CsvSchema==1.1.1
+CsvSchema>=1.1.1,<1.2.0
 argparse>=1.2.1,<1.4.0
-beautifulsoup4==4.3.2
-feedparser==5.1.3
-gevent>=1.0.1
+beautifulsoup4>=4.3.2,<4.6.0
+feedparser>=5.1.3,<5.3.0
+gevent>=1.0.1,<1.2.0
 greenlet>=0.4.2,<0.5.0
--e git+https://github.com/rtdean/grequests@19239a34b00b8ac226b21f01b0fb55e869097fb7#egg=grequests-origin
-netaddr==0.7.12
+grequests>=0.3.0,<0.4.0
+netaddr>=0.7.12,<0.8.0
 pygeoip>=0.3.1,<0.4.0
-requests>=2.3.0,<2.6.0
-sortedcontainers==0.9.4
+requests>=2.10.0,<3.0.0
+sortedcontainers>=0.9.4,<1.6.0
 wsgiref==0.1.2
-unicodecsv==0.9.4
+unicodecsv>=0.9.4,<0.15.0