update posts with new highlighting style, based off redcarpet
config update to use redcarpet markdown parser
remove legacy code
Merge branch 'new-design' of https://github.com/mrmartineau/martineau.tv into new-design

* 'new-design' of https://github.com/mrmartineau/martineau.tv:
  add icons
  add tech.tmw image
  update post content
Merge branch 'new-design' of https://github.com/mrmartineau/martineau.tv into new-design

* 'new-design' of https://github.com/mrmartineau/martineau.tv:
  update ofgem images
update post content and add html5 code clip lib post
add trak & tech.tmw work and update some more
remove these old files
use 404.html as error page
add grunt contrib clean
add imagemin task
update styling
remove these old images
update gruntfile: imagemin