The outlines where not completely shown when multiple elements were put 
beside one another. Now the selected elements of pulled to the top and 
the outline is visible.

Some things had to be tweaked in regards to positioning and sizing of 
elements.
The drag preview is now done with a separate div, which only shows while 
dragging and has the temporary dimensions of the element. When dropped 
it sets the grid values if the dropzone as before.

The main components are right at top level and the directories below
mimic the data structure (unit->page->section).
The toolbar is only used in dev mode and does not belong directly to the
unit view.
The TextEditor is a complex component and deserves it's own directory
even though it is used within the unit-view. Might be refactored to its
own module later.

Can now be repositioned and moved between sections properly.

Before not all cells could be reached in all situations.

- Add (editable) rows to the grid
- Add drag and drop functionality to grid elements. The element is in 
'absolute' positioning mode while being dragged and snaps back to the 
grid when droppped.