Assorted improvements

[tpetricek]

I converted my "literate programming" talk to use the latest version. Looks pretty good! There are still a few things I changed - and I think some of those could be incorporated into FsReveal.

Also, this commit shows how to use FsLab with FsReveal (#1)

As for the changes, I did some tweaks in the template and in the CSS files. See this commit for details.

• I changed some font sizes (the defaults were a bit too big). See custom.css. I also removed some borders around code (which look weird and unintentional)

I had to specify my own template:

• We should have an optional parameter for this!!
• I needed this so that I can include Google Charts. I think having to provide custom template for this is reasonable.
• I commented out the call to hljs.initHighlightingOnLoad(). This highlights random stuff (Like "Hello" in "Hello world") and I think we should disable this by default as we have better colorization.

[tpetricek]

I'm a bit busy at the moment, but concrete things that I'd love to see in FsReval vNext:

• Optional parameter for specifying custom template
• CSS improvements (slightly smaller font, remove box-shadow)
• Remove the hljs highlighting in the default template