A_star Start
addition of the end in the elements
unstable version path
Revert "unstable version path"

This reverts commit 1fab5ee121d8b078784d977396e87d670cc51b16.
A_star version with priority queue
Merge branch 'master' into dev/Path
Merge branch 'master' of http://github.com/Aomeas/1GAM1014