correction to gaussianf, smooth transversal function for vibrate material
Merge pull request #1 from sanromd/utils-dev

correction to gaussianf, smooth transversal function for vibrate materia...
quick fix typo
added 1D material shapes for non-linear chi3 and moving gauss
added 2D material shapes for vibrating membrane, moving gauss and double fiber
added line to decalr width of delta smooth function