initializer and seo tags helper

create default initializer values and move seo tags into partial and use
helper to render that.
add initializer to generator

add initializer file to generator. when run it will copy the initializer
file in the app with everything commented out
moved initializer files

moved template folder to where it should be
cleaning up

the twitter_site_name and fb_app_id shouldn't be visible if there not
present. moved the content for into the partial so it's easier to use
the helper
create blog post presenter

created blog post presenter to take care of meta tags
initialized presenter in controller

added specs and initialized presenter inside controller.
changed the views to use the new presenter class
workaround blog_post_path error

workaround for the blog_post_path error. when calling
blog_post_path(blog_post) i get an error. the fix is a bit more
complicated. we should use the engine as a mountable engine otherwise i
don't think this should work. should look into it. open ticket 82475124
remove old code, cleanup, correct

removed old code, fixed some code
fix presenter specs and url issue

managed to fix the url issue using Rails.application.routes.url_helpers.blog_post_path(blog)
use real object in place of doubles
Merge pull request #48 from mixandgo/feature/initializer_and

Feature/initializer and