added numpy notebook
remove unused files
clean outputs
wordsmithing, array creation
references
array methods
inplace operations
exercise twiddles
move notes to answers
add classroom version
notebook is authoritative now, removing readme
Added a bit more to the Numpy notes that I didn't want to leave out.
adding matplotlib directory and presenter notes
adding python exercise solutions

Updated to remove commit of Intro exercise solutions notebook (which I
already committed in an earlier cherry-pick of this same patch).

Original author: Azalee Bostroem <abostroem@gmail.com>
Original date:   Thu May 9 22:34:10 2013 -0700
Merge branch 'cmu-plus-umass-python-fix-numpy' into 2013-07-cmu

Merge local branch that cherry-picks commits from 2013-05-umass to bring the
python/numpy section up-to-date with the content in that branch.

* cmu-plus-umass-python-fix-numpy:
  Added a bit more to the Numpy notes that I didn't want to leave out.
  notebook is authoritative now, removing readme
  add classroom version
  move notes to answers
  exercise twiddles
  inplace operations
  array methods
  references
  wordsmithing, array creation
  clean outputs
  remove unused files
  added numpy notebook
Merge branch 'cmu-plus-umass-python-fix-matplotlib' into 2013-07-cmu

Merge local branch that cherry-picks commits from 2013-05-umass to bring the
python/matplotlib section up-to-date with the content in that branch.

* cmu-plus-umass-python-fix-matplotlib:
  adding python exercise solutions
  adding matplotlib directory and presenter notes