Solving multiple shapes display order with new function addOrdered
Revert "Solving multiple shapes display order with new function addOrdered"

This reverts commit d4fe4c108b46810399b3e8d0c3b9e2189f7e44a9.
Solves issue #9 : paths ordering and shapes ordering
More complex way to find closer path
Only sort intersecting polygones (slow but correct)
Intersection : perf improvement
Dot product very very closed to 0 caused some problems
Corrected the observer position (if observer has a meaning with
isometric)
Faster 2d-polygon intersection method
Optimization and code cleaning.
Merge remote branch 'upstream/master'

Conflicts:
	js/path.js
Merge remote branch 'upstream/master'
Isomer.p.add now adds paths to be drawn to an array that can be sorted
Bugfix
Clean logs
For backward-compatibility, option expertMode in add
Word was written in french
Cleaning code (booleans)
Merge remote-tracking branch 'mysterix_origin/master'
Generate one Shape for a imported object instead of multiple