Repo reversion script fix - #2720
Adds ability to control libMesh log and implements --timing command line argument (closes #2721)
Merge pull request #2726 from permcody/repo_ver_2720

Repo reversion script fix
Merge commit 'b1d5b178b292cc11784e3a910cf83b71d31e4e8e'
Merge pull request #2727 from aeslaughter/perf-log-2721

Improved performance log control
Merge commit '5a78bea74db65084dbc51bc4348ec3b8e7b1f783'
Using --timing argument in MOOSE to trigger perf_log timing info = #2722
Merge pull request #2729 from permcody/timing_2722

Using --timing argument in MOOSE to trigger perf_log timing info
Merge commit 'e954be1d4c97774c83d78b871e4540cce2b0e90f'