[#781] Begin improving IFacets docs

Better docstrings and an example extension for IFacets. Both still need
some work..
[#1251] Add resource_view table
[#1251] Add resource_view create functions
[#1251] Add resource_view_show
[#1251] Add resource_view_update
[#1251] Add resource_view_delete action function
[#1251] Add title and description to resource_view.
Change 'view_number' to 'order'.
fix merge conflicts
[#1251] updates to resource view logic, remove ordering in the api
[#1251] view reordering and config on top level
merge master fixes
[#1251] add image view
[#1251] add view forms
[#1251] PEP8
[#1251] Show resource views on resource read page.
Still unstyled.
[#1251] Update ckanext.imageview
[#1251] add preview
[#1251] fix merge conflicts
[#1251] fix schema name issue in merge
[#1251] a few changed to how interfaces work