Use email field for password reset (#77)

Fixes unsubmmittable password reset form

app/views/devise/passwords/new.html.haml

@@ -4,7 +4,7 @@
   = bootstrap_form_for(resource, as: resource_name, url: password_path(resource_name), html: { method: :post }) do |f|
     = devise_error_messages!
 
-    = f.text_field :login, autofocus: true, label: "User name"
+    = f.email_field :email, autofocus: true, label: "Email address"
     = f.submit "Send me password reset instructions"
 
   = render "devise/shared/links"

config/initializers/devise.rb

@@ -181,7 +181,7 @@ Devise.setup do |config|
   # ==> Configuration for :recoverable
   #
   # Defines which key will be used when recovering the password for an account
-  config.reset_password_keys = [ :login ]
+  config.reset_password_keys = [ :email ]
 
   # Time interval you can reset your password with a reset password key.
   # Don't put a too small interval or your users won't have the time to