Fix sync_edw.get_all_datasets to use correct loop variable.

The tests here are really brittle and could really do with reworking sometime.
Update README.rst

Change the start postgress
Update README.rst
confirmed 409 failure
Fix test fixtures so that savepoint is rolled back after transaction abort.
Merge pull request #131 from ENCODE-DCC/bad-conflict-1155

Bad conflict 1155
Merge remote-tracking branch 'origin/master' into 1092_es_mapping