Provide a process.title

Set the process.title to 'node-red'.
Helps identify node-red amongst a plethora of other nodejs processes
Aids monitoring systems in identifying running processes
add comment to main.js - how to enable auto clear of debug on deploy
fix email html fa icons... seemed to get lost in merge conflict
Correct logic to avoid 'undefined' label style being inserted.
Fix two trivial HTML bugs.
Reuse vm context to speed up Function nodes

If the NODE_RED_FUNCTION_TIME environment variable is set, the
function nodes publish a status of how long the function took
to run, in ms.
HTTP In delete configuration missing errorHandler
Fixes #384
Check to see serialport exists before opening in Arduino node
Fixes #382

now warns if chosen serial port doesn't exist - rather than crashing.
So is now recoverable without manually editing flows.

(Also moved to fa-icons and Arduino category)
Delay node drop immediate not working
Fixes #381
Merge pull request #380 from hindessm/trivial-html-fixes

Fix two trivial HTML bugs.
Merge pull request #379 from hindessm/fix-undefined-class-on-labels

Correct logic to avoid 'undefined' label style being inserted.
Tweak info of watch and file nodes to be more style consistent with others.
set defaults in trigger node rather than confusing placeholders
make tcp and udp node fa icons more consistent
Indent range node UI more in style with other nodes.
Handle node imports containing tab nodes
Closes #172
Migrate to fa icons.
Merge pull request #377 from hindessm/fa-icon-migration

Fa icon migration
Ignore coveralls upload errors
Part of #299
Remove last remnants of bootstrap icons from core
Closes #376