add company param and instance variable to previews
change method
create instance variables for email previews from search params
add additional params to send test and iframe
update documentation
Merge remote-tracking branch 'olgagr/master'

Conflicts:
	app/controllers/rails_email_preview/emails_controller.rb
	app/views/rails_email_preview/emails/_email_iframe.html.slim
custom params support for CMS integration
bump to v0.2.22
Add Russian