Fix imports

This is how I run it
```python
Python 2.7.6 (default, Nov 10 2013, 19:24:24) [MSC v.1500 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> import ttws.cli
>>> ttws.cli.main(['c:\Python27\Scripts\ttws-script.py', '-c', 'c:\Projects\PlanarMechanics'])
```