Add functions and update grid functions

- Image function added (to have responsive pictures)
- Close function added (to close div elements)
- Container function added (to open a Bootstrap Container)
- Row function added (to open a Bootstrap Row)
- Header function added (to open a Header element)
- CloseHeader function added (to close a Header element)
- Col function updated (best format and best rules)
- OptCol function updated (delete somme unecessary lines)
Merge branch 'v1.1'