fix astar bug with x,y vs col,row
allow astar to use grid weight instead of a fix value (1 and SQRT2)
Merge pull request #19 from pierredavidbelanger/fix_xy_vs_rowcol_in_astar

Fix xy vs rowcol in astar
Merge pull request #20 from pierredavidbelanger/weighted_astar

Weighted astar
Merge branch 'master' into develop
update prim alg