upgraded gulp-minify-css to ~0.3.4 to fix an error with one of it's dependencies (node-clone)
upgraded gulp-minify-css to ~0.3.4 to fix an error with one of it's dependencies (node-clone)

Error: Object.getPrototypeOf called on non-object https://github.com/pvorb/node-clone/issues/28

RolandStuder/styleguide,swiss/styleguide,ComperioAG/styleguide_geologieportal,manuelroth/styleguide,manuelroth/styleguide,RolandStuder/styleguide,manuelroth/styleguide,ComperioAG/styleguide_mont-terri,ComperioAG/styleguide_mont-terri,swiss/styleguide,RolandStuder/styleguide,ComperioAG/styleguide_geologieportal