added uriEncode for GET param for download presentation

...on-html5/imports/ui/components/presentation/component.jsx

...s/presentation/download-presentation-button/component.jsx

...nts/presentation/download-presentation-button/styles.scss

...mponents/presentation/presentation-uploader/component.jsx

...utton-html5/imports/ui/components/presentation/service.js

...i/components/video-provider/fullscreen-button/styles.scss

...utton-html5/imports/ui/stylesheets/variables/palette.scss