Added javadoc
[REQS-403] Adding flexibility to switch discounting calculator

Between ParSpreadMarketQuoteDiscountingCalculator and ParSpreadRateDiscountingCalculator
Merge pull request #160 from OpenGamma/topic/tutorial/swaps/reqs-403

[REQS-403] Adding flexibility to switch discounting calculator
Cleared up the logic in ParameterizedSmileModelDiscreateVolatilityFunctionProvider.from and added test for no points
Spelling
Removed commented out code and correct spelling
arg checks in concatenatedVectorFunction
Added test for full coverage of ParameterizedSmileModelDiscreteVolatilityFunctionProvider
remove redundant comments
Merge pull request #158 from OpenGamma/topic/PLAT-6702

Topic/plat 6702
Merge branch 'refs/heads/develop' into topic/PLAT-6703

Conflicts:
	projects/OG-Analytics/src/main/java/com/opengamma/analytics/financial/model/volatility/discrete/ParameterizedSmileModelDiscreteVolatilityFunctionProvider.java