Fixed #844, MathJax local cache
removed extra spaces
remove debugging output
add ulog instrumentation to track notebook use - closes #795
build rcloud.support after packages because it depends on packages/gist
fix typos
refactor error printing

so it's accessible to code that wants to handle rejections but still log/print them
log/print the error that is causing last notebook not to load
update mathjax cdn
replace mathjax cdn with local copy

Merge branch 'local_mathjax_lib' of https://github.com/prateek05/rcloud into prateek05-local_mathjax_lib

Conflicts:
	htdocs/edit.html
	htdocs/view.html
Merge branch 'prateek05-local_mathjax_lib' into develop