Skip order message processing for now. Every created plates have the stock plate purpose id 2.
Bump version to 0.7.8
UNASSIGNED plates have a purpose id set to 2
Use unassigned plate purpose id when a plate is created
Merge branch 'master' of github.com:sanger/lims-bridge-app into 52625399_fix_plate_purpose
Rebasing
Merge pull request #32 from llh1/52625399_fix_plate_purpose

52625399 fix plate purpose