tweaks

removed second call for membership controller in html
addded stepSlug and step into variables handed to directive
removed restrict 'E' - if we want to use the html element without
javascript it is better to define the directive as attribute than element

Change-Id: I10c875620b1568ac5e6438f316cae12d843ee60a
Merge pull request #1 from jtomasek/jtomasek_membersip

tweaks