converting l10n_br_sale and l10n_br_sale_stock to web_context_tunnel module, preserving all orginial on_change signatures
Merge branch 'develop' into feature/sale-web-context-tunnel
manually complete the context before on_change is played in YAML test to fake web_context_tunnel behavior
that should get Travis-CI passing tests using the temporary web-context-tunnel branch until it get merged
converted l10n_br_purchase to web_context_tunnel; Will only be merged once tested (waiting for more fiscal data to write tests)
Merge branch 'purchase-web-context-tunnel' into develop

Conflicts:
	.travis_install_nightly.sh
	l10n_br_purchase/purchase.py
	l10n_br_purchase/purchase_view.xml
	l10n_br_sale/sale.py
	l10n_br_sale/sale_view.xml
	l10n_br_sale_stock/sale_stock_view.xml