find and fix bugs of BCs and spaceNodes of RectangleTask
move TimoshenkoStandardProjectFactory to project.sample
rename TimoshenkoStandardProjectFactory to TimoshenkoBeam...
add getter of gmodel and a null BCSpecification constructor
make single direction dirichlet boundary conditions work
change ejml version to 2.3
add a sample main to TimoshenkoBeamProjectFactory
add a TensionBar sample