deleted the duplicates
updated 'devDependencies'

Added "grunt-spritesmith". Updated "grunt-newer" from "0.7.0" to
"0.8.0". Updated "load-grunt-tasks" from "0.6.0" to "1.0.0". Updated
"load-grunt-config" from "0.13.2" to "0.14.0".
moved FOLDER STRUCTURE.md to 'doc' directory
updated FOLDER STRUCTURE.md
made the slider navigation centered automaticly
initial commit for 'sprite' task