Deuces dot oh dot oh tho

This is a fairly substantial update that includes the following features & fixes:

• Adds ordered list support, thanks @jonasws
• Performance optimizations
• Improved Presenter View (actually readable notes!) Thanks @rawrmonstar

• Updated deps
• Now with Jest testing
• Console warnings when text smaller than recommended for presentations
• NO MORE <Spectacle /> Tag! Now its just <Deck>.
• ComponentPlayground component built in, thanks @carlospaelinck

• Typeface component, thanks @carlospaelinck
• MarkdownSlides component, thanks @carlospaelinck

Keep your eyes peeled because 3.0 is on the way, with component styling switch to use styled-components

Enjoy!