Change signature of Artisan reaction-type-add command

[antonkomarev]

Resolves #82

This command will create Like type with weight equal to 1:

php artisan love:reaction-type-add --name=Like --weight=1

This command is similar to command above:

php artisan love:reaction-type-add --weight=1 --name=Like

This command will interactively ask for name and after it will create type with weight equal to 1:

php artisan love:reaction-type-add --weight=1

This command will interactively ask for weight and after it will create type with name equal to Like:

php artisan love:reaction-type-add --name=Like