Styling the 'sign up on our meetup page' call to action as a button to increase prominence.
This involved removal of the margin-left on the attending ul, to make it appear all pretty 'n stuff :)

Suggest styling the 'sign up on our Meetup page' call to action as a button, as I feel it was probably being missed by some folk in its previous state

Actioning feedback from jenko - removed central alignment and removed margin-left on the ul to get button and list to line up, and made sure text on the button is always white so it doesnt conflict with green.
Merge branch 'master' of https://github.com/yegnold/unified-diff.github.com