Header system first virsion

The first version out of the header system. Header System is a fully
self-contained system that implements a header with buttons and a login
system by just include the file header.js to your head.

Just include head.js and you have it working.

Header system includes:
Ajax document for login,
A custom css file,
header and login html.
Merge branch 'duggasys-header' of https://github.com/HGustavs/LenaSYS_2014 into duggasys-header