add specs for Post#has_tag
add Post#has_tag
add specs for post title uniqueness
add uniqueness to posts title validations
change Post#has_tag to return only published posts
add index method to posts_controller
move showing posts to a partial
add posts_controller index view
add posts_controller index route
delete whitespaces from begging and end of tags
add translation for search
fix rendering single search resultes
add search form to navbar
add styles for search form
fix bug in post/index.html.erb
Merge pull request #14 from psparabara/add_searching_ability

Add searching ability