[SDESK-26] Fix for ConcurrentModificationException - element is removed via an iterator rather than directly from the collection.
[SDEK-49] Added example of exogenous curve calibration. The first step calibrates 2 curves which are used as exogeneous curves for the second step. The second step is with or without exogeneous block.
Reduced line lengths; removed unnecessary local final modifiers
Merge pull request #147 from OpenGamma/topic/SDESK-49

[SDESK-49] Fixes curve building issue where multiple exogenous curves exist