Update references to insight.formatters in examples

Previously they referenced 'insight.Formatters'
Update library and documentation

Documentation changes include:
- insight.formatters
- insight.Grouping
- Documentation improvements
Merge pull request #224 from matthewdunsdon/feature/update-example-formatters

Update references to insight.formatters in examples
Merge branch 'upstream' into gh-pages-dev
Updates to website after various renaming
Merge pull request #233 from niksoper/gh-pages-dev

Updates to website after various renaming
Add Tables example

An example on how to use tables, letting us check that theming is applied
properly.
Merge branch 'upstream' into gh-pages-dev
Merge pull request #238 from tpkelly/gh-pages-dev

Add tables example
Updated website after lowercase changes to library

constants, scales and formatters are now all lowercase
Copied library code from develop
Merge pull request #243 from niksoper/gh-pages-dev

Updated website after namespace and jsdocs changes to library
Updated table example.
Using hmtl escape characters in code example
Merge pull request #244 from niksoper/gh-pages-dev

Updated table example.