Fix build problems.

Fix build problems.

.travis.yml

@@ -1,7 +1,6 @@
 language: python
 python:
 - 2.7
-- pypy
 - 3.3
 - 3.4
 before_install:

README.rst

@@ -20,15 +20,15 @@ This project follows the standard fork and pull request model of development.
 If you want to contribute changes, then fork the project and code
 away. To set up the environment:
 
-    virtualenv env
-    source env/bin/activate
-    pip install -qr dev-requirements.txt
+* virtualenv env
+* source env/bin/activate
+* pip install -qr dev-requirements.txt
 
 To test across supported platforms:
-    tox
+* tox
 
 To build the docs (in *build/sphinx/html*):
-    ./setup.py build_sphinx
+* ./setup.py build_sphinx
 
 Version History
 ---------------

requirements.txt

@@ -1,2 +1,3 @@
-blist==1.3.6
-cassandra-driver==2.5.1
+blist>=1.3.6,<2
+cassandra-driver>=2.5.1,<3
+tornado>=3.2

test-requirements.txt

@@ -9,4 +9,3 @@
 # minimize breakage to our dev environment.
 coveralls>=0.4,<1.0
 nose>=1.3.1,<2.0.0
-tornado>=3.0.0,<4.0.0