Clean up Branches

[nphilipp]

Stories

1. As a contributor to Duffy,
   I want that branches are named descriptively,
   so that I make changes in the right place.

2. As a contributor to Duffy,
   I want that cloning the repository checks out the branch where development happens,
   so I make my contributions in the right place.

3. As a contributor to Duffy,
   I want stale branches to be clearly named as such,
   so I don't waste time with them.

Acceptance Criteria

• All existing branches are moved to a stale namespace, i.e. renamed to stale/<branch name>
• An empty dev branch is created
• The dev branch is made the default branch

Background

We want to do this from scratch, so all existing content should be moved out of the way. Besides that, master is a loaded term and doesn't really tell you the purpose of this branch.

[siddharthvipul]

@nphilipp can you check once to see if things are looking okay

[nphilipp]

@siddharthvipul looks good to me!