Simple vectorization examples in numpy
using context manager in files tutorial
migrated Leszek's changes to strings-io/tutorial.ipynb
merging in Leszek's changes to gh-pages

Thanks to @czterybity for this contribution, and to @wking for
mentoring this pull request.

Thanks to @r-gaia-cs, @mattphotonman, @gvwilson, @wltrimbl, and
 @ethanwhite for helpful commentary and feedback.
Add %pylab magic so ntoebooks run with plain ipython notebook without pylab=inline argument
fixed Will Trimble attribution
fix IPython capitalization
some suggested fixes to the thw-python vars-types exercises
Merge pull request #195 from gvwilson/gh-pages

Changing month name in YAML header to make it clear that we prefer 3-letter abbreviations.
Changing month name in YAML header to make it clear that we prefer 3-letter abbreviated forms
Merge branch 'gh-pages' of github.com:cliburn/bc into cliburn-gh-pages
Fixes to Cliburn Chan's vectorization lessons
Merge pull request #200 from gvwilson/cliburn-gh-pages

Incorporating Cliburn Chan's vectorization examples (with fixes)
Changing default email address to something real

So that when forkers don't change it it still works.
The EventBrite key for one particular bootcamp was hardwired into the included file.
This is definitely not a good idea, so this emergency fix switches back to a variable.
Merge branch 'gh-pages' of github.com:swcarpentry/bc into gh-pages
git backup intro lesson now introduces the basic concepts of git structure
Update 01-backup.md
Change to working tree to match gitglossary
Add 05-undo.md as alternate way to explain git reset