fix AjaxDatabaseRails::base#search_condition for namespaced model

today i got an error when doing searching 
after tracing rails log, its because #search_condition method replace " " with "" 
this is the case 
let say my model is Statistics::Request with table name "statistics_requests" 
so it will converted to `"statistics_requests"` -> `"statistics_request"` -> `"Statistics Request"` -> `"StatisticsRequest"` 
that's why my model not found

but i'm using activerecord at rspec, you may drop this and back using regular class
and i have changed rspec syntax to latest rspec syntax using transpec gem to remove rspec deprecated syntax