removed tables. updated schema.rb

added migrations to remove the imageables and ckeditor assets. updated schema.rb
deleted ckeditor folder and files

deleted ckeditor folder and files. we do not need this files in any way.
modified remaining legacy code

removed ckeditor from everywhere it is referenced.
missed a few ckeditor references

missed a few ckeditor references so i removed them as well
Merge pull request #30 from mixandgo/chore/remove_ckeditor_with_images

removed ckeditor and imageables table