Use separate email-friendly token for incoming email and let incoming

app/controllers/profiles_controller.rb

app/models/concerns/token_authenticatable.rb

app/models/project.rb

app/models/user.rb

app/views/profiles/accounts/show.html.haml

config/routes/profile.rb

...grate/20160819232256_add_incoming_email_token_to_users.rb

db/schema.rb

lib/gitlab/email/handler/create_issue_handler.rb

spec/features/projects/issues/issues_spec.rb

spec/fixtures/emails/wrong_incoming_email_token.eml

spec/lib/gitlab/email/handler/create_issue_handler_spec.rb