Merge branch 'gh-pages' of github.com:swcarpentry/lesson-example into gh-pages

- "Lesson episodes are stored in _episodes/dd-subject.md."

- "Each episode's title must include a title, time estimates, motivating questions, lesson objectives, and key points."

- "Episodes should not use sub-headings or HTML layout."

- "Code blocks can be have the source, regular output, or error class."

- "Code blocks can have the source, regular output, or error class."

- "Special sections are formatted as blockquotes that open with a level-2 header and close with a class identifier."

- "Special sections may be callouts or challenges; other styles are used by the template itself."

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>

> 0.  Don't panic.

> 1.  Create a new lesson by using GitHub Import, *not* by forking.

> 2.  Run `bin/lesson_inititialize.py` *once* in a new lesson repository to set up standard files.

> 2.  Run `bin/lesson_initialize.py` *once* in a new lesson repository to set up standard files.

> 3.  Run `make lesson-check` to check that the lesson is formatted correctly.

> 4.  Put lesson episodes in `_episodes` (or `_episodes_rmd` if you are writing in RMarkdown).

> 5.  Run `make serve` to preview the lesson website locally.