deps(animate.css): add animate.css library
deps(angular-ui-router): upgrade to 0.2.8
refactor(header): remove unecessary less import
refactor(less): set import path as absolute to make sourcemap file generation easier
chore(gruntjs): add sourcemap generation for css/less file + removed js sourcemap

js sourcemap are not working really well. Will be waiting for grunt-contrib-concat to integrate a sourcemap option

see issue :
https://github.com/gruntjs/grunt-contrib-concat/issues/12
feat(ui-view): add angular-ui ui-view animation when changing page
style(less): correct spaces