Sherpa Prototype

Refactoring
Moving functions from sherpa.js to HeaderModel.js

TestsModel.js added to hold functions from sherpa.js

moving files in subfolders to make it easy peasy

still refactoring styling information into multiple files

improved errors msg panel; ability to delete all errors, scrolling on overflow without moving the trash button

previous was refactoring of CSS file into multiple files. Not finished but already helped fixing things & making it easier to follow.
This upload is adding an error panel, its styling & use it inside org.sherpa.logError in sherpa.js

Playing with styling, using JQuery's Buttons
Errr this source is really in need of refactoring ;P