k1 - converted the header.html to bootstrap responsive format
k1 - took out unnecessary classes from header.css, fixed a bug with avatar's background
k1 - made the design of the search box flat
k1- put the new header in other html files
k1 - fixed a bug where the dropdown menu got hidden under the main page contents
k1 - made header for sign up page
k1 - added the sign up page with a little re-design