Added setup.py file
Added __init__.py for setup.py to work
conf.py:
--------
- removed the syspath statement since I am now using setup.py to
  export modules to python path

second.py:
---------
- Added a second module with a single function to see how this works
  with multiple modules.
index.rst:
---------
- Added second.py as a module to be autodocumented
Added rtd-pip-requirements to allow read-the-docs to install numpy