refactored the structure, all help clases was placed in happah/transformations/mesh_correspondence/. Added kdtree++ headers with corrected namespace.
Updated happah.pro, uncluded happah/transformations/mesh_correspondence/ directory. Added new MeshCorrespondence class, which used for solving correspondence problem.
Merge branch 'deformation-transfer-SS13-group2' of https://github.com/happah-graphics/happah into deformation-transfer-SS13-group2