PLT-353 - Time Series package

New time-series code for Java 8
PLT-353 - Enhance for PR
PLT-353 - Enhance for PR

Remove array and atIndex methods
Add access by lists
PLT-353 - Enhance for PR

Javadoc
Use comparison chain as it does not create objects
Merge branch 'origin/master'
PLT-353 - Enhance for PR

Nullability
Merge pull request #9 from OpenGamma/topic/PLT-353

PLT-353 - Time Series package