update the Jexplore app with a intreface to access icebox layes
include the leaflet.ajax plugin
very basic working interface with icebox api - no styling - yet
work in progress
Merge branch 'geonode2-integration' into icebox-getJson
suport for removing the icebox layer from the leaflet app
provide a custom style
icebox, static, templates, urls:

Piped the ICEBOX_ARTIFACTS_URL local setting into the html
template. It's accssible to the javascript now.
urls:

Cleaned up the OQTemplateView class, added some comments, and made it
a more general-purpose utility.
fabfile:

Added ICEBOX_ARTIFACTS_URL to default local_settings module.
Merge pull request #97 from gem/icebox-getJson

Icebox get json