Fix README.rst import

The pull request fix the missing file `README.rst` in your package `inarpa-0.1.1.tar.gz` : 

```
$sudo pip install inarpa
[sudo] password for 2xyo: 
Downloading/unpacking inarpa
  Downloading inarpa-0.1.1.tar.gz
  Running setup.py egg_info for package inarpa
    Traceback (most recent call last):
      File "<string>", line 14, in <module>
      File "/tmp/build/inarpa/setup.py", line 8, in <module>
        with open('README.rst') as file:
    IOError: [Errno 2] No such file or directory: 'README.rst'
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 14, in <module>

  File "/tmp/build/inarpa/setup.py", line 8, in <module>

    with open('README.rst') as file:

IOError: [Errno 2] No such file or directory: 'README.rst'

----------------------------------------
Command python setup.py egg_info failed with error code 1 in /tmp/build/inarpa
Storing complete log in /home/2xyo/.pip/pip.log
```

Not tested !