Add Travis file, plus requirements for pip

Author: gsnedders

.travis.yml

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+language: python
+python:
+  - "2.6"
+  - "2.7"
+  - "3.2"
+  - "3.3"
+  - "pypy"
+
+before_install:
+  - git submodule update --init --recursive
+
+install:
+  - pip install -r requirements.txt -r requirements-test.txt --use-mirrors
+
+script:
+  - nosetests

requirements-test.txt

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+nose

requirements.txt

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+six