[#78718578] Added initial formatting of approval email
[#78718578] Updated background colors adjusted layout
[#78718578] Began Navigator layout
Handle empty email addresses being sent in send_cart request;  Navigator email: Remove excluded properties
[#78718578] Updated styles for requester name
Added scope and alt tags for 508 compliance
Fixed comment display issue
[#78718578] Minor spec cleanup and fixes
Merge pull request #54 from 18F/78718578_approval_email_ui_update

78718578 approval email ui update

Looks good, ship it!