getStatement uses this method to generate it's OFX format but since it didn't have an end the getStatement(start, end) doesn't work properly; this commit addresses that problem by added the tag; I am not sure it we need to add it to the investment or creditcard if blocks since I am only working with a checking account;
added missing comma from syntax
Merge pull request #18 from buwilliams/master

Added DTEND to OFX for getStatement to work properly