Move examples, MockTrilinos and ReducedMockTrilinos (TriBITS #26)

I moved 'examples' one directory down to tribits/examples so that it can be
more prominent and be found easier.

I moved MockTrilinos and ReducedMockTrilinos into tribits/examples/ because
the developers guide refers to these.
Fix path to MockTrilinos (TriBITS #26)
Updating bulding developers guide (TriBITS #26)

This is just enough to get TribitsDevelopersGuide to build again.  Note that I
had to move a test file into this directory so as the documentation does not
depend on the tests dir.  I want to be able to build this documentation having
just the 'tribits/' directory and nothing else.

I also got the checkin-test.py script to run with --help again.  Just had to
fix a few paths.
Get test/core tests running (TriBITS #26)

Just fixed some directory paths.  This now gives 126 of the 176 tests that I
need to get running again.
Get test/ci_support tests running (TriBITS #26)

Here I fixed the paths.  I also moved 'eg' into tribits/ci_support because it
is needed by the checkin-test.py script for now (but not after TriBITS #15 is
completed).
Get test/ctest_driver/ tests working again (TriBITS #26)

This brings the total number of tests to 156 (just 20 to go).