fixed issue #616
fix #616
fixed #616
fixed #616

corrected the indentation
fixed #616
fix the asset flashing and extra scratchpad.set_readonly calls
fixed issue #705
fixed issue #705. formatting for html content
delete merge artifacts
remove preface from unhandled promise rejection printing

it just obscures the real error
fixes #651
remove duplication of funciton name in github errors

fixes #614
no reason to have a failure handler here.
seems like there was some crufty old error-handling code assuming
a github result object would be thrown.
clear file upload results on opening notebook

fixes #592
start on being able to comment out cells by marking them Text

crashy so far
merge new asset tab fixes from PR #689
fix a bunch of thrown strings without error objects
longer timeout for requirejs

fixes #713
Merge branch 'develop' into comment-cells

Conflicts:
	htdocs/js/rcloud_bundle.min.js
accept that github thinks Text === null

support Text mode better too

ingrain it deep in buffer_model where it won't be repeated
distinguish between undefined and null
remove all the other places we were working around this

initialize cell language map in environment

a few things still broken in this commit
changed the look & feel of overlay,deleted the close button and added ondragleave,fixed the asset drag issue on history notebooks
fixed #705,fixed the flicker issue by introducing settimeout