payment 7.x-1.0-alpha4

This is the fourth alpha release. Major new features are postponed until Payment 7.x-2.x. Only bug fixes and small improvements will continue to be added to 7.x-1.x.

Changes since version 7.x-1.0-alpha3:

• #1541308: Store caller/implementor information in payments
• #1546942: Negative amounts for line items
• #1546940: Remove Payment::expired
• #1576362: /user/%user/payment does not exist if Views is disabled
• #1579608: All menu items should have titles
• #1571170: Use Xtools for testing
• #1579784: Move tests to their module's testing submodules
• #1587218: Wrong variable types returned by payment_schema()
• #1587796: Allow the payment form to accept allowed payment methods
• #1542906: Option to simplify payment_method element if only one payment method is available
• #1572846: Properly prefix permissions
• #1572846: Properly prefix permissions
• #1596482: Loading a payment fails if it has no line items