[PLAT-5806] accept() method for FinancialSecurityVisitor in BillSecurity
[PLAT-5805] Bloomberg loader for bills
[PLAT-5814] Display bill securities in web front-end and green screens
[PLAT-5815] Adding bill security converter with dummy legal entity information
[PLAT-5816] Adding bills to pricing and risk functions
Merge branch 'develop' of github.com:OpenGamma/OG-Platform into develop