xlsconv 0.3.0

xlsconv 0.3.0 brings a number of template enhancements to support new features in wq

• Support for label_template in wq config (dba5c78, f2c1eb3)
• Ability for ForeignKey <select> to reference natural keys and items still in the outbox. (bb8f402, b794a15)
• Various minor fixes (83c7e2c, eab89e6, c41bbd2)