Only pull in activerecord and sqlite3 on new versions of Ruby (1.9.3). This will cause
the storeconfigs spec tests to only run on newer Rubies.
Merge pull request #921 from senior/maint/1.6.x/storeconfigs-tests-only-on-ruby-193

Only pull in activerecord and sqlite3 on new versions of Ruby (1.9.3)