SqlConnection Class and test class created. Open and close functions
passed their respective tests. No other functionality working yet.
SqlConnection and Test class Commented
SendQuery method in SqlConnection has passed simple test. TODO: expand
test to check that correct values are returned from database.
Connection functionality tested & added: getProductByName.
Changed the observable lists to populate using this method.
To do : investigate the slow down in performance this has incurred
Merge pull request #4 from SmartTrolley/SQLConnection

SQL connection implemented. works but needs optimising