[PLT-415] Created a new parameter sensitivity calculator which take into account the underlying curve for curve build as a spread on existing curves.
[PLT-415] Added java doc and cleaned comments.
[PLT-415] Change precision expectation on finite difference results.
[PLT-415] Changed source code to match the new 120 characters rule.
[PLT-415] Cleaned comments and javadoc.
[PLT-415] Correction of typo on a test.
Merge branch 'develop' into topic/plt-415

Conflicts:
	projects/OG-Analytics/src/test/java/com/opengamma/analytics/financial/interestrate/swap/provider/SwapCalculatorTest.java
[PLT-415] Clean comments and add reference to the relevant documentation.
Merge branch 'develop' into topic/plt-415

Conflicts:
	projects/OG-Analytics/src/test/java/com/opengamma/analytics/financial/interestrate/datasets/StandardDataSetsMulticurveUSD.java
Merge pull request #177 from OpenGamma/topic/plt-415

Topic/plt 415