Breaks galaxy eggs

Installing planemo breaks scripts/check/fetch_eggs, e.g.

```
Traceback (most recent call last):
  File "scripts/fetch_eggs.py", line 37, in <module>
    from galaxy.eggs import Crate, EggNotFetchable
ImportError: No module named eggs
```

I believe this is because it installs a galaxy package into:

```
$V_ENV/lib/python2.7/site-packages/galaxy
```
