Remove goto button
Update pioneer for tests
partial work: in the plugin manager, if you click a plugin that is already loaded then unload it.  todo: remove it from the menu, do not allow this action if the plugin is used in the notebook.
detect if user tries to delete plugin that is being used, display warning box instead
remove the evaluator menu items for the plugin when removing the plugin
remove debug logging
remove more debug logging
add license and link to docker hub to Dockerfile
first pass, no major changes, just updates.  autotranslation section still needs to be replaced with the new one.  consider making it smaller so it loads faster, moving content to more smaller focused tuts, each loaded with a click from this one.
fixup Form Tutorial
add start of table of links, css included
overwrote the wrong file, reverting
update tutorial, step 1 add a table with css
add intro text
move r examples to its own file
move ipython examples to its own file
break out groovy examples
break out d3.js section
break out autotranslation
fix links to autotranslation and d3 tuts