Don't use abbreviation 'mins' and 'minutes' in the same sentence.

I don't think saving three letters justifies the use of a non-standard
abbreviation.  If we really need to save letters, then the SI units would
be better and for most people to read.
Merge pull request #432 from hindessm/avoid-abbreviation-and-be-consistent

Don't use abbreviation 'mins' and 'minutes' in the same sentence.
Ensure httpNodePath is handled properly in HTTP/WS nodes

Cope with httpNodePath not ending with a / when it comes to
displaying the node details. The runtime is not affected.
input labels
Fix merge error
Subflow stuff

This commit will get squashed before merging to master
Make subflows draggable and editable
Add subflow history support
Add create subflow menu option