Changed header to v3 - nav elements are now all vertically centred
removed unecessary topbar from header
Added links to training courses on the services page
Removed iframe from training pages and added download links
Download links on the training page now actually cause the files to be downloaded rather than just viewed
Made minor changes to training courses' copy to match that of slides
Slightly modified some of the first persom copy in the videos page, also fixed the margins below each video
Merge pull request #22 from codurance/smallFixes

Small fixes