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Fixed #113: Added a setting variable that lets devs add extra paths to postgresql's search_path.

This way developers can install postgresql extensions in a dedicated schema and make it available globally.
Extensions can be installed to `public` schema too but the `public` is not always added to search_path, for example when running database migrations on --tenant apps.
Merge pull request #116 from owais/master

Fixed #113: Added a setting variable that lets devs add extra paths to postgresql's search_path.
cleaning up code and fixed #65, fixed #115, fixed #121
add template loaders looking for template based on the current tenant

CachedLoader is similar to the django.template.loaders.cached.Loader but
it adds the tenant instance id to the key used for caching.

FilesystemLoader is similar to django.template.loaders.filesyste.Loader
but it uses the setting key MULTITENANT_TEMPLATE_DIRS instead of
TEMPLATE_DIRS and looks for template inside the directory
os.path.join(MULTITENANT_TEMPLATE_DIRS, tenant.domain_url).
Merge pull request #103 from entrouvert/master

added template loaders for finding templates based on the current tenant
Fixed issue with sync_schemas not recognising models in directory
(Removed models attribute check on result of get_apps() since this
does not encompass all scenarios)
Merge pull request #125 from helenst/fix-sync-schemas

Fixed issue with sync_schemas not recognising models in directory
removing deprecation warning
rewrote separate projects section
added new setting TENANT_CREATION_FAKES_MIGRATIONS, issue #64
now properly migrating to current state, thanks daniel ferreira
Fix #41 - set settings_dict['SCHEMA'] for south.

This is required by SOUTH to perform migrations correctly.
Merge pull request #131 from chrisfranklin/patch-1

Fix #41 - set settings_dict['SCHEMA'] for south.
Merge remote-tracking branch 'remotes/upstream/master'