Jupytercards

Fixes a bug created by the last release that blocked loading cards via string or file. Should be fixed now.

Fix some bugs in Javascript and issues in Python that may cause problems on some non-Jupyter platforms

The Reload arrow is now drawn as a SVG, so page does not have to have MathJax already loaded.

Now you can easily create flashcards in Markdown and use the md2json() conversion function to convert to the required JSON format.

Future versions of display_flashcards() may consume be able to directly take Markdown as an input, but I'll leave that for another day ;-)

Change CSS style names:

card -> flashcard
cardtext -> flashcardtext

to avoid conflict (now and potential) with Jupyter Book/sphinx.

Updated to allow math on front of cards.