stub out url for exhibit cloning
initial update to inspect to incldue clone buttons, user login logic and widget consistency
adding link to refresh data source
fix serializing without a data profile, move clone stubs to upload
clone works
build a custom range index for numeric slider
update to django-extensions 1.3.2 to get rid of deprecation warnings
change deprecated mimetype kwargs to HttpResponse to content_type
ensure update source form gets the correct context
remove view for reference, shuffle the order of some declarations
add an is_update flag to data source update context for later use by templates
bypass form for reference DS refresh, any other potential future DS types that don't need to define a form
Merge pull request #56 from LibraryOfCongress/feature/clone-me

Feature/clone me
consistent behavior for the labelling of facets.

By default, they will be blank, which in most cases displays the selected property label.  A custom label can still be defined.  The default label for the 'search' facet will remain as 'Search'.
Merge pull request #57 from LibraryOfCongress/feature/consistent_facet_labels

consistent behavior for the labelling of facets.