Utlity functions to diff objects from the debugger
Added #noqa comments to commented lines > 80 chars
Reintroduced some tests that were marked XFAIL

ckan_api_client/tests/functional/client_lowlev/test_dataset_crud.py

- test_dataset_simple_crud
- test_dataset_delete
[#18] More tests for the CkanDataset.extras field, that still have strange behavior

But tests are all green, the problem is more likely to be somewhere else..
Reintroduced test_data_loss_on_update test from ckan_api_client/tests/functional/client_lowlev/test_data_loss_on_update.py
More helper functions for low-level-client-based tests
[#14] Added some tests for dataset update using high-level client

But still having problems with extras.. :( need investigating further