refactor
Relase "BestAnswer" feature
rename #tirgger_best! to #toggle_best!
added tags_spec.rb file
added Tag and Tagging model
add relations and validates to Tag and Taggins model
add relation for question to tags
tags work, but need add test and refactor
Improve Tags feature for Question with autocomplete
fix tags acceptance spec
Added Tags index page
refactor tags feature
add vote model without spec
add vote feature