Merge pull request #442 from timschofield/develop

Develop
Merge pull request #443 from timschofield/develop

Add in graph of stock cost over time
Merge pull request #444 from timschofield/develop

Show costs on report
Change value of option from the value to the key of the array
fix WO entry costing calculations to take into account BOM effectivity dates
09/06/2014 Exson: Fixed the Delivery Date lossing bugs when change Warehouse. Reported by akits from minghao.hk(weberp) bbs.
Merge pull request #445 from fahadhatib/develop

Develop