Have Syntastic ignore angular attribute warnings

The Syntastic HTML linter will warn on propriety attributes. The
likelihood that you *accidentally* typed "ng-repeat" is low. Let's just
assume you know what you're doing and ignore warnings about "ng-*"
attributes.
Upgrade `migrate` alias for Rails 4.1

Rails 4.1 no longer defines `rake db:migrate`:

https://github.com/rspec/rspec-rails/issues/936