Revision of the Getting Started lab.
Another sleight change to the Getting Started lab.
A revision ov the Arrays lab. Added a section on transposes and different
sorts of reshaping.
A few more edits to the arrays lab
Merge branch 'master' into typofixes
Further revision of the arrays lab
Added a little more to the arrays lab and cleaned up another typo.
Another small change to the arrays lab.
Added a short bit on ufuncs to the arrays lab.
Sleight wording change in arrays lab.
Swapped out main problem in the Arrays lab.
edits and small fixes

Fix spelling and some minor grammar.
small corrections and fixes
cannot find source for extensibility with C++
more minor fixes
Merge pull request #11 from ayr0/arrayprobs

corrections and fixes
Revised solutions for Arrays lab
I changed A to 1, B to 2 and C to 3 in the markov chain lab so that the directions would match up with the pictures.
Typo fixes in Arrays lab and redid array_solutions.py
Removed a stray image alloc_vs_resize.pdf that was in the folder for the
arrays lab. Also added a brief warning to avoid appending to arrays to
that lab.