Leena&Michal: Replaced calls to new_claim_draft by calls to SessionDraft.new_claim_draft. SessionDraft no longer dependent on flask's sesion
Merge branch 'master' into session_draft_roll_out_phase_one
Merge pull request #197 from InsolvencyService/session_draft_roll_out_phase_one

Leena&Michal: Replaced calls to new_claim_draft by calls to SessionDraft...