Add a requirements.txt to use with travis.

Rename the README so we can put markdown in it

.travis.yml

@@ -6,7 +6,7 @@ python:
   - "3.4"
   - "pypy"
 install:
-  - "pip install -r requirements.txt"
+  - "pip install -r requirements.txt ."
 script:
   - python tests/command_list_test.py
   - python tests/module_test.py