more work on plots -> rpubs
rpubs upload: cleanup title and comment extraction logic
rpubs: require rmarkdown package or standalone page generation
rpubs: initial implementation of plot publishing
viewer pane: prevent reactivation on resume & client init
rpubs: don't require title for publishing from plots/viewer
hide preview button during upload
rpubs: intelligent zooming of plots for publishing
improved html template for plot publishing
use consisent icon and verb ("Publish") for both RPubs and ShinyApps.io
disable editing of data frames and matrixes in server mode
stub viewer export commands
Merge remote-tracking branch 'origin/master' into feature/viewer-export
move plot export code to a common module
factor common elements out of export classes
pass previewer to save plot as image dialog
more factoring out common functions from plot export
stub for viewer export to image
add viewer_export query param
prevent signed/unsigned comparison