[PLAT-6463] Removed not null constraint
Merge pull request #47 from OpenGamma/topic/PLAT-6463

[PLAT-6463] Removed not null constraint
[LTN-79] Transfer the AssertSensitivityObjects method to main and correct spelling. (vince)
PLAT-6464 - Move @Config from AbstractCurrencyMatrix to CurrencyMatrix Reviewed-by: Stephen
Update release notes
[PLAT-6466] Create SecurityLoaderTool: to load a list of Securities defined by ExternalId (eg Bloomberg Ticker, ISIN)