add cucumbers for sign in feature

“attempts to sign in” is not the same thing as “signs in”. When I said “error out” I meant “cucumber should throw an exception” - I wasn’t referring to a valid system behaviour.

On Monday, 28 July 2014 at 16:02, Phil Lee wrote:  
> In features/sign_in.feature:
> > @@ -0,0 +1,33 @@ > +Feature: Sign in > + As a registered MAS user > + I want to sign in > + So that I get better financial tools and advice > + > +Scenario: Sign in disabled > + When I sign in  
> But this is the current behaviour which is the desired behaviour. When the user attempts to sign in we give them an error.
>  
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> Reply to this email directly or view it on GitHub (https://github.com/moneyadviceservice/frontend/pull/558/files#r15467155).
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