Revert "Update sunspot_rails from 1.3.3 to 2.1.0. Updates to rsolr, sunspot and nokogiri (1.5.10)."

This reverts commit 2b3e9f8132cd89241f0b6a8dd9b143418cdca368.
Revert "Update sunspot_solr from 1.3.3 to 2.1.0."

This reverts commit 0ec9da8faa41cad18ee017b6908fbcc91c9bf8d6.