switching flag order for jekyll
Added novice reference page on recognising shell, Python and editors within a shell window and how to exit from these
Making instructions for checking bootcamp home pages more prominent
Improve "Recognising prompts" section

- Add images
- "How to exit" right after the images.
Fix English at Prompt reference

Thanks to @mikej888.
Merge pull request #518 from drlabratory/jekyll-flags

switch order of jekyll flags in Makefile
Merge pull request #565 from gvwilson/making-check-more-prominent

Making instructions for checking bootcamp home pages more prominent
Fix make-book.py when handle images

Add support for Markdown extension for images.
Merge pull request #582 from r-gaia-cs/fix-book-images

Fix make-book.py when handle images
Merge pull request #553 from r-gaia-cs/recognising-shell

Improve for recognising shell
Merge branch 'master' of https://github.com/swcarpentry/bc