hack to reverse the polarity of portal-update-worker
make push for portal update optional
push apikey option for portal-update
add gzip option to load-datasets and dump-datasets
add mirror option to portal-update command
we need fixes in ckanapi 2.1
Merge pull request #307 from wardi/master

new options: portal-update --push-apikey/--mirror, dump-datasets/load-datasets --gzip