remove nose as requirement for running client, add it as requirement for tests

Author: dkador

setup.py

@@ -3,11 +3,12 @@
 from distutils.core import setup
 
 setup(name="keen-client",
-      version="0.1.1",
+      version="0.1.2",
       description="Python Client for Keen.io",
       author="Keen Labs",
       author_email="[email protected]",
       url="https://github.com/keenlabs/KeenClient-Python",
       packages=["keen"],
-      install_requires=["requests", "nose"]
+      install_requires=["requests"],
+      tests_require=["nose"]
 )