Merge pull request #5 from pcaspers/CDS

todays work ...
direction update
renamed index
Merge pull request #6 from pcaspers/CDS

some small fixes, add an example for the isda pricing
case when both iterators equal. Not very elegant..
Merge pull request #7 from pcaspers/CDS

cds
some modfis on the default accrual. To be revised by Peter
fix eta
add example 3