Began implementing responsive design

Added breakpoints
Updated video layout depending on screen width
Cleaned up video gallery html
Styled header and large videos

Vertically stacked header for smaller screens
Large videos resize rather than overflowing on smaller screens
Updated viewport scaling so site displays correctly on mobile devices
made mobile nagivation menu more user friendly

styled navigation content such that on smaller screens the user selects menu options from a dropdown menu
updated index.html content to match current IgniteBaltimore site content
fixed padding in navigation menu
Merge pull request #2 from smartlogic/master

Responsive Layout