[add] sale dropshipping: do not merge orders with different destination addresses
[imp] dropshipping: populate the destination address when merging two purchase orders
[FIX] dest_address_id must be a tuple to be added in field_list
[FIX] to populate the merged order, provide id of dest_address instead of browse_record
[ADD] add purchase-workflow branch in travis file, needed to install purchase_group_hooks in sale_dropshipping
Revert "[ADD] add purchase-workflow branch in travis file, needed to install purchase_group_hooks in sale_dropshipping"

This reverts commit a8c5290ffa2bf6c1ee4f13b39e58bfae900602c8.
[ADD] add purchase-workflow branch in travis file, needed to install purchase_group_hooks in sale_dropshipping
[UPD] get address with a simple way
[UPD] unify version declaration in travis file
Merge pull request #27 from rdeheele/7.0-dropshipping-merge-po-lep

Merge PO with sale_dropshipping