added tests for laplacian pyramid
added tests for laplacian pyramid

cbecker/vigra,dstoe/vigra,psteinb/vigra,capturePointer/vigra,cha007/vigra,ThomasWalter/vigra,dstoe/vigra,dagophil/vigra,psteinb/vigra,ThomasWalter/vigra,stuarteberg/vigra,dagophil/vigra,DaveRichmond-/vigra,dstoe/vigra,dstoe/vigra,DaveRichmond-/vigra,DaveRichmond-/vigra,kod3r/vigra,martinsch/vigra,timoMa/vigra,psteinb/vigra,xiwei-zhang/vigra,cha007/vigra,capturePointer/vigra,ThomasWalter/vigra,dstoe/vigra,kod3r/vigra,mmuellner/vigra,timoMa/vigra,dagophil/vigra,psteinb/vigra,kod3r/vigra,timoMa/vigra,martinsch/vigra,kod3r/vigra,capturePointer/vigra,kod3r/vigra,mmuellner/vigra,capturePointer/vigra,martinsch/vigra,stuarteberg/vigra,kod3r/vigra,dagophil/vigra,kod3r/vigra,funkey/vigra,dagophil/vigra,xiwei-zhang/vigra,hmeine/vigra,funkey/vigra,mmuellner/vigra,cbecker/vigra,mmuellner/vigra,cha007/vigra,martinsch/vigra,xiwei-zhang/vigra,DaveRichmond-/vigra,cbecker/vigra,xiwei-zhang/vigra,funkey/vigra,ThomasWalter/vigra,cha007/vigra,cbecker/vigra,hmeine/vigra,timoMa/vigra,timoMa/vigra,martinsch/vigra,DaveRichmond-/vigra,hmeine/vigra,capturePointer/vigra,dagophil/vigra,funkey/vigra,stuarteberg/vigra,stuarteberg/vigra,dstoe/vigra,DaveRichmond-/vigra,stuarteberg/vigra,funkey/vigra,stuarteberg/vigra,cha007/vigra,DaveRichmond-/vigra,timoMa/vigra,ThomasWalter/vigra,xiwei-zhang/vigra,capturePointer/vigra,funkey/vigra,dagophil/vigra,psteinb/vigra,mmuellner/vigra,hmeine/vigra,ThomasWalter/vigra,funkey/vigra,cha007/vigra,cbecker/vigra,psteinb/vigra,xiwei-zhang/vigra,mmuellner/vigra,cbecker/vigra,cha007/vigra,capturePointer/vigra,mmuellner/vigra,ThomasWalter/vigra,stuarteberg/vigra,xiwei-zhang/vigra,psteinb/vigra,hmeine/vigra,martinsch/vigra,timoMa/vigra,hmeine/vigra,hmeine/vigra,dstoe/vigra