Merge pull request #28 from adhishm/version_0.0_simulateSingleSlipPlane_ForcePeachKoehler

Version 0.0 simulate single slip plane force peach koehler
Merge pull request #29 from adhishm/version_0.0_simulateSingleSlipPlane_debugTimeIncrement

Introduced LARGE_NUMBER = 1000 and fixed time increment.
Merge branch 'version_0.0_simulateSingleSlipPlane_fixedTimeIncrement' of github.com:adhishm/dd2d_Matryoshka into version_0.0_simulateSingleSlipPlane_fixedTimeIncrement
Introduced virtual function forceBalanceDistance.
This virtual function will return equilibrium distances for balancing a
given value of force.
Additional comments to explain Dislocation::forceBalanceDistance
The distance must be negative
Renamed virtual function to equilibriumDistance
Added mu and nu to arguments of moveDislocationsToLocalEquilibrium
Added basic structure through comments in
SlipPlane::moveDislocationsToLocalEquilibrium
Merge branch 'version_0.0_simulateSingleSlipPlane_fixedTimeIncrement' of /media/PNY16GB/work/PostDoc/DD2.5D/programs/c++/heirarchicalModel into version_0.0_simulateSingleSlipPlane_fixedTimeIncrement