update travis config

use UNIT_TEST=1 so as not to have to worry about installed modules breaking the
tests of other modules
[WIP] test an experimental maintainer-quality-tools branch
Add module ngo_purchase_requisition
This module serves as a base for NGO addons. It add a view
which provides better priority on fields for NGO needs.
Rename view for purchase requisition
Add translation file template
Add ngo_purchase
Add terms and conditions tab
Reorder fields in delivery tab
Move company_id in Accounting tab
Add missing changes from purchase_requisition_bid_selection
Open lines of purchase requisition in form view
add missing module name in xmlid
Fix module name
Add field payment term on the view
Fix related field req_bid_tendering_mode
Add dependency on purchase_delivery_address
Hide fields from purchase order to save room
Add the create call for bids button in LR line
Add a specific view for purchase order line
Fix pep8