Removed seems_pronounceable/seems_unpretentious/seems_quiet checks in lib/text_sentinel.rb

This fixes the validation problem of topics/posts written in all CAPS, with only meaningless symbols :) or with very long [smartass]words[/smartass], that we are fond of having in our very polite Boards. We decided to keeps the seems_meaningful validation as it is based on a very objective measure that is entropy, that we set to 0 in our SiteSettings anyway. Once Milou and ZenithM manage to create a strong AI we will revise this decision, and replace the text sentinel with an intelligent agent that merely verifies that our posts, if they were to be too polite and net-etiquetteish, contain at least some trace of sarcasm.