#178: Belos: Provide `Tpetra` version of BlockGmres examples

[cwschilly]

Fixes #178

This PR converts the following examples:

• [x] BlockGmres_Epetra_File_Ex
• [x] PseudoBlockGmres_Epetra_File_Ex
• [x] BlockGmres_Galeri_Ex

Note: currently, the following examples cannot be converted due to their use of a preconditioner (the original examples use Ifpack; however, including IfPack2 creates a circular dependency with Belos)

• BlockPrecGmres_Epetra_File_Ex
• PseudoBlockPrecGmres_Epetra_File_Ex
• BlockFlexPrecGmres_Epetra_File_Ex
• BlockPrecGmres_Galeri_Ex
• BlockGmresPoly_Epetra_File_Ex

[cwschilly]

@stmcgovern This PR is ready for review