'Cookies' is not defined error

'Error processing 'to_html' on 'CFMLHttp': global name 'cookies' is not defined'

```
Error processing 'to_html' on 'CFMLHttp': global name 'cookies' is not defined
Traceback (most recent call last):
  File "/var/www/sentry/local/lib/python2.7/site-packages/sentry/utils/safe.py", line 16, in safe_execute
    result = func(*args, **kwargs)
  File "/var/www/sentry/src/sentry-cfml/sentry_cfml/interfaces.py", line 77, in to_html
    'cookies': cookies,
NameError: global name 'cookies' is not defined
```

This has been fixed in this commit -- I think. Python isn't a language I'm normally in.