Basic sass principles applied to stylings and general tidy up

[tanyapowell]

@empowerhack/drawmylife

• font awesome gem added (Issue #60)
• all colours assigned to variables
• began assigning commonly used dimensions to variables
• each page/view/component in its own modular file

Will continue with #58 as I go along

[steverabino]

The rest of the changes I'll need to check out the branch and have a look at when I go home - will have thumbs/comments tonight though

[steverabino]

LGTM :+1: