More responisveness; Tidying; Documentation; Test harness

* Spaces instead of tabs in all HTML files
* Responsive layout for example-charts.html
* Responsive layout for hello-world.html
* Switch to self-sizing charts in examples
* Switch to self-sizing chart in hello world
* Make pretty, and better organised, REFERENCES.md
* Fix URL for DataWrappers-common in test/index.html
* Re-order Gruntfile to make more logical sense
* Using coffeelint and thus 2-space indenting