Added CategoriesMigrater
Added WordsMigrater
Added UsersMigrater
Added PostsMigrater
Added BestAnswersMigrater
Added CleanPostsMigrater
Added LastActionMigrater
Added 2 string extension methods
- ToInteger
- StripHtmlTags
Installed NEST client for ElasticSearch
Small rename in LastActionMigrater
Added ElasticSearchService for working with ElasticSearch
Added ElasticSearchMigrater
Final touches