--Add code behind login
Merge branch 'mtoanmy' of https://github.com/luongchautuan/BaseInvoices into chautuan

# By Toàn Mỹ Trần Châu
# Via Toàn Mỹ Trần Châu
* 'mtoanmy' of https://github.com/luongchautuan/BaseInvoices:
  add pop up in add invoices
  change flow add invoices
  add flow add invoices

Conflicts:
	BaseInvoices/VController/AddCustomVC/BIAddCustom.m
	BaseInvoices/VController/AddCustomVC/BIAddCustom.xib
	BaseInvoices/VController/AddProductsVC/BIAddProducts.h
	BaseInvoices/VController/AddProductsVC/BIAddProducts.m
	BaseInvoices/VController/AddProductsVC/BIAddProducts.xib
--Change pop up mark paid