Fix Bond Example
DatedOisRateHelper

Initialize the termStructureHandle, which is used directly without
initialiszation
Merge pull request #6 from edawui/master

DatedOisRateHelper : Initialize the termStructureHandle, thx edawui
Merge branch 'master' of https://github.com/amaggiulli/qlnet into bootstrap_bond_on_dirty_price

Conflicts:
	Examples/Bonds/Bonds.cs
Enable QL_NEGATIVE_RATES
Merge branch 'enable_QL_NEGATIVE_RATES' into bootstrap_bond_on_dirty_price
Enable the dirtyPrice in Bondfunctions too
Reorder methods. Add dirtyPrice overload