[#2553] Fix autodetect for tsv resources

When you upload or link to a TSV file and don't specify a resource format,
the format that you end up with is text/tab-separated-values.
This is not recognized by the DataPusher and the resource is not uploaded to
 the DataStore.

This patch adds this alternative representation to the canonical resource
format list.

ckan/config/resource_formats.json

@@ -18,7 +18,7 @@
   ["MDB", "Access Database", "application/x-msaccess", []],
   ["NetCDF", "NetCDF File", "application/netcdf", []],
   ["ArcGIS Map Service", "ArcGIS Map Service", "ArcGIS Map Service", ["arcgis map service"]],
-  ["TSV", "Tab Separated Values File", "text/tsv", []],
+  ["TSV", "Tab Separated Values File", "text/tsv", ["text/tab-separated-values"]],
   ["WFS", "Web Feature Service", null, []],
   ["ArcGIS Online Map", "ArcGIS Online Map", "ArcGIS Online Map", ["web map application"]],
   ["Perl", "Perl Script", "text/x-perl", []],

ckan/tests/lib/test_helpers.py

@@ -109,3 +109,12 @@ def test_includes_existing_license(self):
         eq_(dict(licenses)['some-old-license'], 'some-old-license')
         # and it is first on the list
         eq_(licenses[0][0], 'some-old-license')
+
+
+class TestResourceFormat(object):
+
+    def test_autodetect_tsv(self):
+
+        eq_(h.unified_resource_format('tsv'), 'TSV')
+
+        eq_(h.unified_resource_format('text/tab-separated-values'), 'TSV')