Switched to prop-types package to remove new React 15 warnings

...-html5/imports/api/slides/server/modifiers/resizeSlide.js

bigbluebutton-html5/imports/startup/client/intl.js

...luebutton-html5/imports/ui/components/about/container.jsx

.../ui/components/actions-bar/actions-dropdown/component.jsx

...mports/ui/components/actions-bar/emoji-menu/component.jsx

...mports/ui/components/actions-bar/emoji-menu/container.jsx

bigbluebutton-html5/imports/ui/components/app/component.jsx

bigbluebutton-html5/imports/ui/components/app/container.jsx

...orts/ui/components/audio/audio-notification/component.jsx

...rts/ui/components/audio/audio-stream-volume/component.jsx

...imports/ui/components/audio/device-selector/component.jsx

...ton-html5/imports/ui/components/button/base/component.jsx

...uebutton-html5/imports/ui/components/button/component.jsx

bigbluebutton-html5/imports/ui/components/chat/container.jsx

...ml5/imports/ui/components/chat/message-form/component.jsx

...ents/chat/message-form/message-form-actions/component.jsx

...ml5/imports/ui/components/chat/message-list/component.jsx

...ponents/chat/message-list/message-list-item/component.jsx

...chat/message-list/message-list-item/message/component.jsx

...ml5/imports/ui/components/chat/notification/container.jsx