restore some sanity to the import order

git-svn-id: https://android.svn.wordpress.org/trunk@935 a6565c4b-a94d-4d28-bb26-aa9e5ab542c0
refresh blog content on posts refresh

Move RefreshBlogContentTask into ApiHelper (probably not the best place
for it long term, but it will suffice for now) and trigger it when
refreshing the posts list.

git-svn-id: https://android.svn.wordpress.org/trunk@936 a6565c4b-a94d-4d28-bb26-aa9e5ab542c0