IATI/iati-datastore — pull request #157 by joetsoi (2014-02-10 13:18:26+00:00)
Title: use package_search instead of package_list for fetch_dataaset_list

adds an option to iati crawl update command
```
iati crawl update -t
```
where n is an integer, will search for packages modified in the registry for the last n days. instead of crawling through all the datasets.