Add ratings from design call 10/01/2014

Further work in progress
Complete MoSCoW rating of authoring tool requirements

As per design call on 21/01/2014
Regroup requirements into releases + MoSCoW rating

Complete regrouping of 'Must for v0.1'
Completed re-ordering of requirements according to release and MoSCoW rating
Merge pull request #9 from adaptlearning/feature/requirements

Feature/requirements