[bug]LineString::toPolygon_2() for empty polygons
add tests for area
add some unit tests
Merge branch 'master' of https://github.com/Oslandia/SFCGAL
add offset example
add LineString::reserve(n)
add algorithm::force3D
allows 2D geometry in algorithm::extrude
add example
configure doxyfile
configure doxyfile
merge extrude
fix OffsetTest
Merge branch 'master' of https://github.com/Oslandia/SFCGAL
fix outputs in test-regress-convex_hull
round test
Merge branch 'master' of https://github.com/Oslandia/SFCGAL
Merge pull request #9 from mborne/master

offset tests & round