Merge pull request #97 from yegnold/master

Updated jekyll help in readme.md
Adding progressive enhancement and dont be afraid to commit talk videos
Adding breaking bugs video
Make all twitter links open in new tab
Merge pull request #98 from jenkoian/moar-vids

Adding progressive enhancement and dont be afraid to commit talk videos
Fixing typo on November 2012 video heading
Styling 'sign up on our meetup page' call to action as a button to increase visibility. Removed margin-left on attendn ul to get button and list to line up, and changed font colour of the button to always white despite :visited state.

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.