Convert libmesh_cast_{ptr,ref} -> cast_{ptr,ref}

Refs #3737.
Fixing Examples Makefiles problems
closes #3751
Merge pull request #3758 from permcody/example_makefile

Fixing Examples Makefiles problems
libMesh update.  Refs #000.
Add Executioner::terminate() (#3735)
Add Terminator UserObject (#3735)
Deduce needed postprocessors (#3735)
move logic from Executioner into Problem (#3735)
Move Terminator UO into core, new test (#3735)
fix missing initializer (#3735)
Simplify test, fix "teh" (#3735)
make test non-random (#3735)
Merge pull request #3739 from dschwen/terminate_3735

Terminate solves cleanly based on Postprocessor values
Merge pull request #3738 from jwpeterson/libmesh_cast

Convert libmesh_cast_{ptr,ref} -> cast_{ptr,ref}