Code cleanup.

git-svn-id: http://svn.finmath.net/finmath%20experiments/trunk@452 48fcbb9e-5639-0410-8b25-842128a4905d
Code cleanup.

git-svn-id: http://svn.finmath.net/finmath%20experiments/trunk@484 48fcbb9e-5639-0410-8b25-842128a4905d
Changed RandomVariableInterface and RandomVariable to be fully immutable. This step is to prepare for the introduction of some cool Java 8 features.
Some more code clean up.

git-svn-id: http://svn.finmath.net/finmath%20experiments/trunk@488 48fcbb9e-5639-0410-8b25-842128a4905d
Added lib revision 490 to spreadsheets. Revised spreadsheets to ensure compatibility with revision 490.

git-svn-id: http://svn.finmath.net/finmath%20experiments/trunk@492 48fcbb9e-5639-0410-8b25-842128a4905d