First draft of tutorial

Needs editing down a bit to reduce length
Needs code highlighting and styles for example code
Tweaked and copy edited version of the tut section
Add styles for tutorial section and prism.js for syntax highlighting

Add minified highlighting for JS
Add styles as SCSS partial and tweak to taste
Add prism via script tag - couldn't work out how to add it with Require
to ensure global Prism variable is availble and plugin runs correctly
Add classes to HTML for prism
Add styles and colors for tutorial section
Add tutorial section to nav and remove "Who?" because it's really the footer
Fix color of "contribute on github" with a specificity boost
Add link to tutorial in copy beneath regex result

Tweak navscroll.js to bind clicks to any internal links and scroll
Show 1st example as something usable and mention the use of JS regex literal notation for demo purposes.
Fix error in replace example.
Make PrismJS work with RequireJS.
Fix reference to regexcavate for in tutorial so it actually works
Mention that the regex is in JS and use &rsquo; in contractions.
Merge branch 'tutorial' into dev

* tutorial:
  Mention that the regex is in JS and use &rsquo; in contractions.
  Fix reference to regexcavate for in tutorial so it actually works
  Make PrismJS work with RequireJS.
  Fix error in replace example.
  Show 1st example as something usable and mention the use of JS regex literal notation for demo purposes.
  Add link to tutorial in copy beneath regex result
  Fix color of "contribute on github" with a specificity boost
  Add styles for tutorial section and prism.js for syntax highlighting
  Tweaked and copy edited version of the tut section
  First draft of tutorial

Conflicts:
	index.html