Remove remaining global scans in tests

to speed up running individual tests

Fallback to the `railties` version when the `rails` gem is missing.

Rails apps that don't include `actionmailer` or `activerecord` might not have
the meta `rails` gem on their Gemfile, but the `railties` gem instead.

Expand SSL verify mode to Net::HTTP.start options

Remove copied/unchanged/unused SexpProcessor code

Add CodeClimate test coverage

Add Model, Controller, Template, Config classes

Report parsed files in debug output

instead of using hashes for everything

Update Slim, Highline, Ruby2Ruby dependencies

Drop 1.8

Make Array.new into an array and Hash.new into a hash

Treat String#html_safe the same as raw()

Better handling of string concatenation

Remove unnecessary new call creation in template processing

Several XSS check fixes

at least until fixed to work with the latest