packaging: bump version to 0.1.1 and small packaging improvements

This commit includes the following changes:
1. Version is bumped to 0.1.1
2. A new method for defining the version in a single place in the
   codebase is defined.  Now, we need only to update the version
   in the version.py file.
3. We now include the generated README.rst with sdist packages and
   use this rather than complaining about missing'pandoc/pyandoc'.
   Most users of the library will not have those installed.
packaging: add comment explaining get_version implementation
Merge pull request #15 in PYTHON/python-devicecloud from 0.1.1-release-prep to master

* commit 'aff8cc0a7d3e4c1d20d7ced0895f66161943d2cf':
  packaging: add comment explaining get_version implementation
  packaging: bump version to 0.1.1 and small packaging improvements