`Pay Now` - a link but styled as a Bootstrap button
Offer button - margin below to add space
Large `Pay Now` button below the text ( above the contact admin )
Button Color changed to green
Merge remote-tracking branch 'upstream/master'
Conditional to prevent the creator and some others seen the bid button
Hiding horizontal rulers if button below is not on display
top button color changed to green/success
Offer Categories - reused existing helper method

There was an existing helper method to format offers, possibly written
by me in the prev iteration. Used it in th current view:

ex: http://localhost:3000/groups/1#offers

It places the offers in a linear view that the the prefix text 'Listed in'.

Reg: isue - 268