[#1495] add res_type to solr schema
[#1495] solr schema versions are floats
[#1495] test for res_type in solr index
[#1495] leave schema version at 2.3
[#1396] Updated HTML contrubuting docs to be more up to date
Merge branch '1396-html-contributing-docs'
Merge branch '1495-index-resource-type' of https://github.com/wardi/ckan into wardi-1495-index-resource-type
Merge branch 'wardi-1495-index-resource-type'