added transient signle phase example, added assert to catch requirement about timeVaryingCoefficients flag in SinglePhaseDarcyCoefficients
checked parallel, added petsc.options and README file
Merge branch 'master' of github.com:erdc-cm/proteus into adding_tests
commented out stray print for vertexFlags for PlanarStraightLineGraph
added a test_poisson2d script
test script for transient groundwater flow example
put in changes recommended by Aron in pull request comments except for assert for TimeVaryingCoefficients in SubsurfaceTransportCoefficients
cleaned up restructured text for README in single_phase_gw
Merge pull request #38 from erdc-cm/adding_tests

Adding tests