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
Merge pull request #1 from jdcorless/master

Small changes to 01-backup.md and added 05-undo.md as an alternate
simplified discussion of git reset
spelling error
added table and some MD formatting to 01-backup.md, deleted 05-undo.md
Merge pull request #2 from jdcorless/master

added table and some MD formatting to 01-backup.md, deleted 05-undo.md
Update 01-backup.md
automergable version of intro git material
Template for ipynb

Template for ipynb to make lessons have the same style of others
markdown lessons and necessary changes in Makefile since now
ipynb -> md -> html.

This come from @gvwilson.

Related to issues:

- [site/119](https://github.com/swcarpentry/site/issues/119)
- [site/321](https://github.com/swcarpentry/site/issues/321)
- [bc/179](https://github.com/swcarpentry/bc/issues/179)
Some improves in template

- Add input mark
- Add output mark

BUG:

- `output.text` in `stream` block end with new line character
Fix for ipynb template

- Escape all text input and output. This is require to avoid
  troubles with `<`, `>` and other characters that have special
  meaning in HTML
- Replace markdown syntax for images output with HTML
Seeding the intermediate material on Make
Seeding intermediate material on the bash shell
Initial commit
Pulling in content from main 'bc' repository
Restoring README.md broken by bad shell script
Redoing the slides without Bootstrap or Reveal in our repo