+FastKdTree declarations
-Windows Fixes
Made compatible to MSVC2012
Made compatible to MSVC2012
Merge branch 'fastkdtree-SS13-group1' of https://github.com/happah-graphics/happah into fastkdtree

Conflicts:
	happah.pro
	happah/kdtree/FastKdTree.h
merged happah.pro
again?:
+changed happah.pro
+compatibility to MSVC2012
+TriangleVertices method for clipping and AABB
~Circle: f suffix for doubles
~main() method with TEST-Makro
~Split Plane Strategy: Changed methods. Only need buildKdTree()