Icon colours added

- Includes new colours from the theme
fixed issue 17
Merge pull request #18 from adaptlearning/issue/17

Issue/17
Style updates to show disabled states

- Updated to show disabled states
- Added correct and incorrect colours
- Given button margin to match the Matching component
Merge pull request #19 from zenduo/develop

Various style improvements
Changed H5/H6 tags to Span for buttons/options
Included global variables to make consistent
Merge pull request #20 from zenduo/develop

Consistency updates and use of global vars
Fixes #21
_.each statements did not include 'this' scope
Merge pull request #22 from adaptlearning/issue/21

Fixes #21
Merge branch 'master' of https://github.com/adaptlearning/adapt-contrib-mcq into develop

* 'master' of https://github.com/adaptlearning/adapt-contrib-mcq:
  Conflicts: 	js/adapt-contrib-mcq.js
  Squashed commit of the following:
  Squashed commit of the following:
Merge remote-tracking branch 'origin/develop'

* origin/develop:
  Fixes #21 _.each statements did not include 'this' scope
  Included global variables to make consistent
  Changed H5/H6 tags to Span for buttons/options
  Style updates to show disabled states
  fixed issue 17
  Icon colours added