Start making constraint checking optional so that Djangae is GAE budget friendly
Emphasise that the constraint checking is enabled by default
Make sure you can disable/enable constraint checking to your hearts content
Link to the section correctly in the README
Fix some formatting
Fix mistake in the docs
Remove unused import
Add meta class SubfieldBase to IterableField to fix fields returning None when they should return empty iterables
Merge pull request #79 from kirberich/master

Fix IterableFields return None instead of empty iterables
Merge branch 'configurable-constraints' of https://github.com/potatolondon/djangae

Conflicts:
	README.md
Fix setfield (sets aren't supported by the datastore)
Patch update_contenttypes so that it's less likely to fail due to eventual consistency
Slight tweak to bulk inserts
Fix some bugs with filters on empty lists, and make sure we don't return incorrect results when using negated special indexes
Always use field.db_type over connection.db_type, in fact, remove that
Don't die if the datastore returns a long rather than an int
Add a link to djangae-scaffold in the README
Fix whitespace
Fix link
Allow counting on the primary key