Merge pull request #12 from VasylRishko/tournaments-logic

Tournaments logic
Merge pull request #11 from VasylRishko/datetimepicker

Datetime picker
generate Post MVC.
add ability to attach image to posts.
show posts on home page.
create association User has many Posts; add posts to seeds.rb
test coverage for posts.
Merge remote-tracking branch 'remotes/origin/posts' into staging