fix default branch in history
add spaces around assignment operator
shorten line
clean the code, fix diff of first commit retrieval
Add pry-byebug gem.

This allows us to navigate through the code with the debugger.
Delete repositories and other data after a spec
Merge branch 'add_pry_byebug_gem' into develop
Merge branch 'fix-default_branch_in_history' into develop
Merge branch '865-introduce-diffs-controller' into develop
Merge branch '1058-delete_repositories_after_spec' into develop