Removing a 'using namespace libMesh' from parallel_implementation.h,
fixing the resulting fallout.

Thanks Michael Povolotskyi for bringing this issue to our attention.
Fixing namespace issue in adjoints_ex5.
Fixing reduced basis examples after recent namespace changes.
Fixing namespace issue in misc ex7.
Fixing namespace issues in misc_ex9.
Merge pull request #243 from libMesh/namespace

Namespace