Merge branch 'develop' of git@github.com:Dolibarr/dolibarr.git into develop

.travis.yml

dev/skeletons/modMyModule.class.php

htdocs/compta/facture.php

htdocs/compta/facture/class/facture.class.php

htdocs/compta/facture/list.php

htdocs/compta/facture/mergepdftool.php

htdocs/core/class/extrafields.class.php

htdocs/core/class/html.form.class.php

htdocs/core/class/html.formmail.class.php

htdocs/core/lib/product.lib.php

htdocs/core/modules/project/doc/pdf_baleine.modules.php

htdocs/fourn/class/fournisseur.product.class.php

htdocs/fourn/facture/card.php

htdocs/install/mysql/migration/3.8.0-3.9.0.sql

htdocs/install/mysql/tables/llx_product.sql

...cs/install/mysql/tables/llx_product_fournisseur_price.sql

htdocs/langs/en_US/bills.lang

htdocs/langs/en_US/mails.lang

htdocs/langs/en_US/main.lang

htdocs/langs/en_US/other.lang