update for ruby-2, rails-4 and rspec-3 #238
                
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updates a couple specs for rspec-3
updates dependencies and a couple of queries for rails-4
NOTE: the same 2 specs that are broken on master (as of commit f3cab9e) are still broken
spec/casserver/utils_spec.rb:16 and spec/casserver/utils_spec.rb:22
NOTE: lib/casserver/authenticators/sql.rb -> matching_users() query should be updated too, but I'm lazy