FIX: Fix email

Not sure if we should merge now since it might end up needing a bunch of rebases. @agramfort feel free to close and do this later if you want :) I just used:
```Bash
sed -i 's/gramfort@nmr.mgh.harvard.edu/alexandre.gramfort@telecom-paristech.fr/g' $(git ls-files)
```
fix :)