Icon rework
Update debug icon
Add flowFilePretty option
Set content-length in HTTP response node
Fixes #233
Disable max event listener warning on server
Fixes #238
Make sure file name gets passed on in file node
Add flash of status to exec node
Add binary capabilities to Serial node - along with timeout,  fixed 
buffer size and binary output options. Also updated icons and added strict
checking.
Add strict mode and latest icons to http node(s)
Serial port - missed no split char option. If no split char then send every
character in char mode.
and honour text (utf8) mode in single char mode.  aaargh.
Update serial info to match new capabilities.
Update comment node to fa icons - plus matching node icon.
Add missing name field to file (in) node
(and tweak icons to new style)
Log close errors rather than pass up the stack
revert logging of every url request from http reg node.
Make sure buffers are nulled to ensure cleanup.
Add italic style to name for exec function...
been missing for ages... who knows why :-)
Allow retained status message to be cleared
Add new HTML (cheerio/jquery like) parser node ...