Merge pull request #9 from django-nonrel/feature/refactor-ordering

Adapt to djangotoolbox's new _get_ordering interface

https://github.com/django-nonrel/djangotoolbox/commit/bd292d69c45d93ca87885af86ee38ecf56a34043
Merge pull request #7 from aburgel/taskqueue-stub

Respect queue.yaml in tests.
Allow the --allow_skip_files flag to be passed down to dev_appserver
Correct typo
Fix the help message and remove trailing whitespace
Merge pull request #12 from lukebpotato/develop

Allow the --allow_skip_files flag to be passed down to dev_appserver
ignore .DS_Store
Added 'disable_task_running' flag to runserver
Merge pull request #20 from kensaggy/develop

Added 'disable_task_running' flag to runserver
Do not polute data dumped from a remote datastore with info messages. See issue #5.
Fixed admin history not working by adding GAE indexing for LogEntry.object_id. See issue #4.
PEPification, style normalization and trivial clean up.
Some additional tests showing how the back-end handles primary and foreign keys, added to avoid breaking the current behaviour with refactorization.
Adapt to parent leaving AutoField conversions to back-ends.
Parent now passes a field rather than its column and db_type to add_filter.
Adapt to parent also passing fields to insert.
Pass primary key field to update_entity similarly to the rest of compiler methods.
Adapt to new data types; implement DatabaseCreation.db_type method that may serve to replace related_db_type infrastructure, will make switching between storing related fields' values as db.Keys or plain values possible and can handle overriding of the type for indexed / unindexed "string" fields.
Provide a convert_values implementation; move decimal deconversion where it should be; drop double handling of decimal conversion (not needed with Decimal.get_db_prep_lookup workaround).
Reimplemented conversion of values for the datastore, moving them to DatabaseOperations, pushing db.Key creation down to conversions (thus simplifyiing add_filter), and making use of parent handling for nonrel fields.