interface corrected (several vertices may be retrieved in a single step)
issue with starting point not on origin.
New test straight line.
Merge pull request #12 from homeostasie/master

Issue with straight line not starting from origin.
Merge branch 'master' into alphaShape
convex hull helpers update (open and closed curves)
 new test, just for alpha-shape on boundaries of half-planes
Rajout des procédures brutes.
alpha-shape right side.
 algo for alpha-shape of straight line
Merge branch 'algorithm'
Update testAlphaShapeStraightLine.cpp
Merge branch 'master' of https://github.com/troussil/convergents into alphaShape
Algorithm for alpha-shape Straight line
Show a bug on convexhull
Add test for alpha-shape straight line
solved bug on short straight-line
solved an issue in special case
merge branch alphaShape to alphashapecircle