Replace whitespace with "%20" before scraping url.

With this commit, url strings such as
```
http://api.navitia.io/v1/coverage/fr-idf/places?q=13 rue man&type[]=stop_area&type[]=address&depth=1
```
would be cut off to
```
http://api.navitia.io/v1/coverage/fr-idf/places?q=13
```