Add 3D shock bubble example, with IPython notebook plotting example using yt and mplot3d.
Merge branch 'master' into shock_bubble_3d

* master:
  Fix calls to logger in pyclaw/solver.py.
  Don't store gamma1 in problem_data.
  Raise exception when weno_order!=5 and kernel_language==Python.
  Clearer error message when tfluct is not set.
  empty_tfluct to default_tfluct, and summary of if statements inside default tfluct function
  added documentation on attribute tfluct on sharpclaw/solver.py
  removed tfluct from src in Makefile
  stub functions now are empty_tfluct at the top of sharpclaw solver.py
  changed amdq2 to adq in tfluct solver for Euler 1D
  added dimension dependenpt tfluct stub functions
  euler 1d example modified to use new solver tfluct workflow
  ability to take tfluct solver as input in solver
  Add titles and use literal strings in example docstrings.
Merge pull request #465 from ketch/shock_bubble_3d

Add shock-bubble 3d example, including cutplane and isosurface plotting in ipython notebook