Revise sign-in, sign up specs for case-insensitivity
Revise sign-in, sign up specs for case-insensitivity

Devise began humanizing the authentication_keys variable referenced in its default locale file in version 4.1.0.  Setting specs to look for case-insensitive error messages that would contain "Email" based on authentication_key.

christinalcole/rails-project,christinalcole/rails-project,christinalcole/rails-project