(even though the contents are not validated)

This avoids things like:

  ~$ cat tools/validation_helpers.py
  ...
          return self.is_block(ast_node) and has_heading~$

with your next prompt way over to the right ;).

From http://getbootstrap.com/components/#panels-alternatives
the only panel that the font color is white is
`panel-primary` and for that reason it is the only one that we can't use.

This replace the use of `panel-primary` with `panel-warning`
since prerequisites and learning objectives **never**
appear in the same file.

Blockquotes that have a header (with class "callout", "challenge",
"prereq", "objectives") as their first element will get rendered as
<div>s.  Their structure will resemble Bootstrap's panel:
http://getbootstrap.com/components/#panels-alternatives

There's currently an issue with pandoc: the header nested under the
blockquote will never have assigned attributes.  This is causing the
panel's heading to look enormous.  I'll fix it in
https://github.com/swcarpentry/styles/pull/11.

BTW: glyphicons won't render correctly unless 'fonts' directory gets
moved up one level to the 'css' directory. I'll fix that in
https://github.com/swcarpentry/styles/pull/11 too.

This is based on 966a0322 from gh-pages.

Thanks to @ChristinaLK to report the problem.

Our authors use this label to mark unfinished/work in progress lessons.

Implement template-specific callout rules. Add tests and fix bugs revealed.

Narrow def of callout: block must have heading.

Simplify way that callout counts are tracked, improve log messages, and add further unit tests of callout validation.

Ensure that callout validation is actually run

default instead of figure/.

- Delete GitHub's default label that will not be used
- Create new labels
- Update color for labels

1.  Adding `tools/chunk-options.R` with support for Pandoc-based conversion of R Markdown to plain Markdown.
2.  Modifying `Makefile` to handle any R Markdown files that are present.

Changes have been checked by @jdblischak in the `r-novice-inflammation` project.

Changes to link text validation per #58 and #90. Validate link text in index.md (always), or only in headings (reference.md and instructors.md)

Demote msg level when http links skipped

Strip anchor from filenames in error messages

Fix typo

This solves #77 by add id attribute to every item of a definition.

This reverts commit 0b370670.

Revert "Minor changes to make error messages consistent, and possibly less crashy. Still need unit tests to trigger this code."

This reverts commit 8c0819be.

Minor changes to make error messages consistent, and possibly less crashy. Still need unit tests to trigger this code.