Function readSlipPlane now reads the current simulation time
The input file now contains a quantity Current time. This value is set
as the initial time for the simulation.
In the function singleSlipPlane_iterate the starting time is given by
currentTime
Added total time writing in SlipPlane::writeSlipPlane
Merge pull request #36 from adhishm/version_0.0_simulateSingleSlipPlane_fixedTimeIncrement_addInitialTime

Version 0.0 simulate single slip plane fixed time increment add initial time