Merge pull request #17 from twinbit/page-alter-datasets-breadcrumb

Dataset breadcrumb page_alter (moved from dkan_sitewide pull request #54)
Issue nuams/dkan#55: Fixing help messages for dkan_dataset_api settings
Merge pull request #18 from twinbit/og-wrong-counter

fix wrong dataset counter
Merge pull request #19 from nuams/dkan_issue_55_update_links_in_api_documentation

Issue nuams/dkan#55: Fixing help messages for dkan_dataset_api settings
fix node/add/dataset using url()