Update graphite show command to allow for graphs that include spaces in ...

...their name

We have a couple of graphite graphs that have spaces in; current implementation means no matter what we search for, we only ever see the top matching graph;

i.e. we have:

```
alex.Top 100
alex.Top 5000
alex.Top Grouped By X
```

Performing a `graphite show Alex.Top Grouped By X` will always return `alex.Top 100`.

This fix solves that issue.