Remove stop words for the Kebab Case Name Strategy

My thinking is that we should have a configuration option to list stopwords and populate it by default with all the English stopwords. This should cover:

• Any language (admins can add or replace the default stopwords by those in any language)
• Negation (admins could remove negative stop words if they want). Note that I'm not sure it's needed since you can phrase the page name positively or use some some other word (instead of "cant-login" you can use "unable-login" for example)