augmented ckan resources list. Closes #51
encoded ckan search strings. Fixes #50.
added string distrib graph for catalog stats with mock data in ckan selection

- added d3, d3 layout , xregexp, rickshaw libraries
- subdivided  odrext/externals/  into folders
finished implementing the ckan graph. Closes #34

- made external libraries naming scheme more consistent
- adopted rickshaw 1.4.3, not minified
- still need to properly center graph. See https://github.com/opendatatrentino/OpenDataRise/issues/52
Merge branch 'master' of https://github.com/opendatatrentino/OpenDataRise