Fixes issue #176, fstream header was missing
Switching from VTK output to ExodusII output
Merge pull request #177 from SylvainPlessis/v0.50.0-fix-Libmesh_comp

Fixes issue #176, fstream header was missing
Merge pull request #178 from dmcdougall/exodus

Switching from VTK output to ExodusII output
Fix simpleStatisticalForwardProblem example
Make exmple code input file paths match installed tree
Merge pull request #180 from dmcdougall/fix-example

Fix simpleStatisticalForwardProblem example
Merge pull request #187 from dmcdougall/fix-valcycle-eg

Make example code input file paths match installed tree
[queso/multilevel_doc-> manual] Adding all the work done on the manual about the multilevel method. It includes new description of MCMC, MC and ML, with their algorithms. New class diagrams generated by dot+doxygen, and updating Queso classes names to remove the 'uq' and 'Class'. ML method section needs reviewing.
[queso/src-> multilevel_doc] Adding documentation for MLSampling class.
[queso/src-> multilevel_doc] Adding documentation for MLSamplingOptions and MLSamplingLevelOptions classes.
[queso-> multilevel_doc] Adding the corrections Damon had the the ML section of the user's manual and a typo in MLSampling.h.
Wrapping some lines
Merge pull request #189 from dmcdougall/multilevel_doc

Multilevel doc
[queso/manual->examples]: creating a new tex file for the examples, editing examples/validationCycle/src/exTgaValidationCycle_appl.h and examples/validationCycle/src/exTgaValidationCycle_gsl.C for looking correctly in the user's manual. Last edits in examples chapter before v0.50.0 release.
[queso/manual->examples]: creating a new tex file for the examples, editing examples/validationCycle/src/exTgaValidationCycle_appl.h and examples/validationCycle/src/exTgaValidationCycle_gsl.C for looking correctly in the user's manual. Last edits in examples chapter before v0.50.0 release.

Conflicts:
	examples/validationCycle/src/exTgaValidationCycle_appl.h
[queso/examples]: updating examples/Makefile.am so it sends histyy.m with the simpleStatisticalInverseProblem, and so it sends simple_fp_plots.m with simpleStatisticalForwardProblem. Editing makefile examples, eg Makefile_sfp_example_margarida, to reflect new QUESO version.
Forgot to update examples/validationCycle/src/exTgaValidationCycle_appl_old_computes_stats.h
Merge pull request #190 from dmcdougall/edit_examples_v0.50.0

Edit examples v0.50.0
Merge branch 'v0.50.0-release' into dev