Added code to transitions to add time deltas and compute the median.
Changed median to mode (name goof) and added interface methods to ITransition.
Added comparable interface to ITime.  Added median computation to transition.
Patched up some code and added tests.
committed tests.
For partition transitions, even number of deltas returns the middle of the two center deltas.
Commented computeDelta function.
Method for computing the mean of deltas. Extremely hackish implementation.
Throw exception for when computeDelta is called on a VectorTime instance.
Fixed an error in commenting.
More commenting for computeDelta
Initial implementation of ITimeSeries class.
Moved computing mode/median/mean of deltas into ITimeSeries class.
More changes to make Transition use an ITimeSeries object. Note: TransitionTests are broken.
Added increment and division methods to objects implementing ITime.
Updated comments.  Added computeMean to ITimesSeries.  Fixed up most tests.
Fixed unit tests and moved them to a more appropriately named file.
Small comment update.
Some commenting for ITimeSeries.
Added tests for computing the mean.