* started python API reference guide
* Added test to the API reference guide
* Added Price break
* added context variables to the build section
* Cleand up build section and added new example
* Fine tuning
* fixed picture
* removed unfinished python reference guide
* Added allocated_stock to the build rreport
* Added contect variables for user model
* Added link to user in build.md
* Fixed misunderstanding of can_complete
* Added context variables for Suppliers
* Fixed typos