developed email_spec.rb
made code convention refactoring in email_spec.rb
improved code (syntax only) according to 'code conventions'
added double-indentations in few blocks of code
deleted some ugly code-indentation (with 'end' mostly) according to 'code convention'. Hope it`s final commit.
Merge pull request #36 from Sergey-Russiyan/develop

Please, review my code.