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
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
Adding drop check to Delay tests
Prevent adding empty twitter creds
Closes #372
Merge pull request #385 from zobalogh/delay-test-fix

Adding drop check to Delay tests
Merge pull request #363 from kylegordon/patch-1

Provide a process.title
Incorrect credentials in mongo node
Closes #386
Avoid wasting time preparing the payload if operation is a delete.
Fix variable name, emailkey should be globalkeys.

Also, remove unused reference to util.
MQTT node should only send message if topic actually specified (string)
Remove spurious dollar.
Fix base64 encoding of msg.payload in UDP out node.