is_public must be "True" - mismatch with docs

[justinsb]

The docs here say that for x-image-meta-is-public, “on, 1, true” are all true values:
http://glance.openstack.org/glanceapi.html

However, the code only accepts 'True':
def get_image_meta_from_headers(response):
...
    if 'is_public' in result:
        result['is_public'] = (result['is_public'] == 'True')

[Jay Pipes (jaypipes)]

Damn you for actually reading our docs, Justin ;)