Change route drawing to use get instead of match for Rails 4 compatibility.
Don't allow multiline strings for email format

Rails 4 issues an exception when validates_format_of encounters regex
that uses ^ and $ rather than /A and /Z.

See this pull request https://github.com/rails/rails/pull/6569

Alternative would be to add the :mutliline => true option to the format
regex, but that seems unnecessary and risky.
sign_out should use DELETE, not GET
Test rails 4.0.0.beta in appraisal
Removed irrelevant spec for regex testing.
Inadvertently trimmed out email format regex spec.
Rails 4.0.0.beta gemfile.