Load methods package

Building `md` from `Rmd` in a script like this will break if the `methods` package is not called and the code includes class object routines. See https://github.com/r-spatial/sf/issues/478

Output episode figures in correct order

Add Library Carpentry SVG logo

Fix logo at navbar

by run

~~~
$ find _includes -type f -exec sed -i "s/page.carpentry/site.carpentry/g" {} \;
$ find _layouts -type f -exec sed -i "s/page.carpentry/site.carpentry/g" {} \;
$ find _extras -type f -exec sed -i "s/page.carpentry/site.carpentry/g" {} \;
$ find _episodes -type f -exec sed -i "s/page.carpentry/site.carpentry/g" {} \;
$ find bin -type f -exec sed -i "s/page.carpentry/site.carpentry/g" {} \;
$ find assets -type f -exec sed -i "s/page.carpentry/site.carpentry/g" {} \;
~~~

Unify Library Carpentry logo

Close #155

Link LC as for SWC and DC

See https://github.com/swcarpentry/workshop-template/issues/410

This reverts commit 1e56203d.

Add all in one lesson build with Javascript

Make challenges and discussion visibles

This is based on
https://github.com/swcarpentry/instructor-training/pull/437/files and
https://github.com/swcarpentry/instructor-training/pull/439/files,
both write by @ErinBecker.

Updated CONDUCT.md

Rebased of https://github.com/swcarpentry/lesson-example/pull/116/.

Thanks to @tracyteal.

Suggest template language

Add Library Carpentry to the workshop template

make sure that checkpoint version is 0.4.0 or higher

fix swcarpentry/lesson-example#118: use checkpoint::scanForPackages

Includes @drjwbaker's description of Library Carpentry.

Improve wording on syllabus.html

As suggested by @gcapes.

Revert "ensure dt elements have an id set"

Numbering the lessons in the schedule

Related with https://github.com/swcarpentry/styles/issues/80.

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