Windows: spaces in config dir path and C* 2.0

When using path with spaces in the home dir or in the config-dir, clusters using C\* 2.0 or below are not able to start.

To reproduce it on Windows command line:

``` bash
> python ccm create test -v 2.0.10 --config-dir="C:\path\with some\spaces"
> python ccm populate -n 1 --config-dir="C:\path\with some\spaces"
> python ccm start --config-dir="C:\path\with some\spaces"
```

Using the latest version it does work with C\* 2.1, but not with C\* 2.0.x.