Merge pull request #33 from ezoehunt/master

Added changelog, updated pdfs to images.
Flow for concept: "Devhub is a drop-off service"
Flow for concept: Devhub hosts remote repositories
added ui concept for dropoff as service
Merge pull request #37 from neocatalyst/master

added ui concept for dropoff as service
Update OmniGraffle concept files
Update OmniGraffle concept files
Update OmniGraffle concept files
Update OmniGraffle concept files
Update Axure interactive UI flow files
Update Axure interactive UI flow files
Update “App manager is Devhub” with 2 alt. flows
Update OmniGraffle concept files
Add graffles for concept flows