Merge branch 'hotfix/sastry-python-quickfix'
merge 06629b5 from develop
restore R code completions

fixes #1129
properly encapsulate/relay completions to languages
add call to rcloud.get_completions for ace/mode/python

for #708
restore python support

broken by an incomplete merge of feature-langs

fixes #1141
@s-u, @sisukapalli, please check if i missed anything this time
it is running okay on my OSX, but i haven't tested further
use c-style folding for r code

seems to work
fixes #1107
workaround for file upload bug

larger file uploads can fail in Chrome (#984)
this may be an Rserve bug
uploading in smaller chunks avoids the problem
Merge branch 'hotfix/chunk-size-workaround' into develop

Conflicts:
	htdocs/js/rcloud_bundle.min.js