nsot Demo failing to run

```
./run_demo.sh
Database not found; creating database...
Traceback (most recent call last):
File "/usr/local/bin/nsot-server", line 11, in
load_entry_point('nsot==1.1.3', 'console_scripts', 'nsot-server')()
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/util/core.py", line 302, in main
initializer=initialize_app,
File "/usr/local/lib/python2.7/dist-packages/logan/runner.py", line 193, in run_app
management.execute_from_command_line([runner_name, command] + command_args)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 341, in execute
django.setup()
File "/usr/local/lib/python2.7/dist-packages/django/__init__.py", line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File "/usr/local/lib/python2.7/dist-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/usr/local/lib/python2.7/dist-packages/django/apps/config.py", line 199, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/models.py", line 21, in
from . import fields
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/fields.py", line 45, in
class BinaryIPAddressField(models.Field):
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/fields.py", line 47, in BinaryIPAddressField
__metaclass__ = models.SubfieldBase
AttributeError: 'module' object has no attribute 'SubfieldBase'

Loading demo data fixtures...
Traceback (most recent call last):
File "/usr/local/bin/nsot-server", line 11, in
load_entry_point('nsot==1.1.3', 'console_scripts', 'nsot-server')()
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/util/core.py", line 302, in main
initializer=initialize_app,
File "/usr/local/lib/python2.7/dist-packages/logan/runner.py", line 193, in run_app
management.execute_from_command_line([runner_name, command] + command_args)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 341, in execute
django.setup()
File "/usr/local/lib/python2.7/dist-packages/django/__init__.py", line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File "/usr/local/lib/python2.7/dist-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/usr/local/lib/python2.7/dist-packages/django/apps/config.py", line 199, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/models.py", line 21, in
from . import fields
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/fields.py", line 45, in
class BinaryIPAddressField(models.Field):
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/fields.py", line 47, in BinaryIPAddressField
__metaclass__ = models.SubfieldBase
AttributeError: 'module' object has no attribute 'SubfieldBase'
Starting web service...
Traceback (most recent call last):
File "/usr/local/bin/nsot-server", line 11, in
load_entry_point('nsot==1.1.3', 'console_scripts', 'nsot-server')()
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/util/core.py", line 302, in main
initializer=initialize_app,
File "/usr/local/lib/python2.7/dist-packages/logan/runner.py", line 193, in run_app
management.execute_from_command_line([runner_name, command] + command_args)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 341, in execute
django.setup()
File "/usr/local/lib/python2.7/dist-packages/django/__init__.py", line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File "/usr/local/lib/python2.7/dist-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/usr/local/lib/python2.7/dist-packages/django/apps/config.py", line 199, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/models.py", line 21, in
from . import fields
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/fields.py", line 45, in
class BinaryIPAddressField(models.Field):
File "/usr/local/lib/python2.7/dist-packages/nsot-1.1.3-py2.7.egg/nsot/fields.py", line 47, in BinaryIPAddressField
__metaclass__ = models.SubfieldBase
AttributeError: 'module' object has no attribute 'SubfieldBase'
```